How to Troubleshoot Galaxy S23 Display Black Bars

Black bars appearing on your Galaxy S23’s display are almost always a software or app compatibility issue — not a hardware failure. The S23 uses a 20:9 aspect ratio Dynamic AMOLED 2X screen, and older apps designed for 16:9 displays will letterbox (top/bottom bars) or pillarbox (side bars) rather than stretch the image. The good news: the fix usually takes under two minutes. This guide walks through every known cause and solution as of 2026, including One UI 6.1 and One UI 7 differences.

What Causes Black Bars on Galaxy S23 Displays

Before diving into fixes, knowing the cause tells you which solution to try first:

Cause	Black Bar Location	How Common
App not optimized for 20:9 aspect ratio	Top & bottom or sides	Very common
Full Screen Apps setting disabled for the app	All edges	Common
Navigation bar overlap (button nav mode)	Bottom only	Common
Display scale set too large	All edges	Moderate
System UI glitch / temporary graphics bug	Anywhere	Moderate
One UI 7 camera cutout setting bug	Top area	Moderate (post-upgrade)
Physical display damage (cracked LCD layer)	Persistent, any area	Rare

Fix 1: Enable Full Screen for the Specific App (Most Common Fix)

This solves black bars for the majority of users. Samsung’s One UI lets you force individual apps to fill the entire screen, overriding their built-in aspect ratio restrictions.

On One UI 6 / 6.1 (Android 14):

1. Open Settings → Display
2. Scroll down to Full Screen Apps
3. Find the app causing black bars in the list
4. Toggle it On — the app will now stretch to fill the S23’s full 20:9 display

On One UI 7 (Android 15):

Samsung removed the dedicated “Full Screen Apps” menu in One UI 7. Instead:

1. Go to Settings → Display → Camera Cutout
2. Tap the app from the list
3. Select Hide Camera Cutout — this forces full-screen rendering for that app

Note: Some users on One UI 7 report the Camera Cutout workaround doesn’t fully resolve side black bars for legacy apps. In those cases, the third-party app Fullscreen Immersive (free on Google Play) can force any app into full-screen mode using Android’s immersive flags.

Fix 2: Adjust Per-App Aspect Ratio Inside the App

Many streaming and video apps have their own internal aspect ratio control that overrides the system setting. This is especially common in YouTube, Netflix, Amazon Prime Video, and Plex.

• YouTube / Netflix: While a video is playing, double-tap the screen or tap the expand/crop icon (usually bottom-right corner). Look for a “Fill” or “Fit to screen” toggle.
• Samsung Gallery: Tap the three-dot menu → Slideshow → disable letterboxing, or pinch-to-zoom to expand the image.
• Other apps: Tap the three-dot or overflow menu within the app during playback and look for “Aspect Ratio,” “Full Screen,” or “Zoom” options.

Fix 3: Switch to Gesture Navigation (Fixes Bottom Black Bar)

If you see a black bar only at the bottom of the screen, your navigation bar is the culprit — not the app. Switching to gesture navigation removes the persistent navigation bar.

1. Open Settings → Display → Navigation Bar
2. Select Swipe Gestures instead of Navigation Buttons
3. Optionally, under More Options, toggle off Gesture Hint to hide the thin gesture indicator line at the bottom

If you want to keep button navigation but hide the bar inside specific apps: install Good Lock from the Galaxy Store, then add the NavStar plugin inside Good Lock. NavStar lets you auto-hide the navigation bar on a per-app basis.

Fix 4: Restart Your Galaxy S23

A temporary GPU or System UI glitch can produce black bars that disappear on reboot. If the bars appeared suddenly after opening an app or after a notification, this is the fastest test:

1. Hold the Side Key (power button) until the power menu appears
2. Tap Restart
3. Once rebooted, check if the black bars persist

If bars only show up occasionally and go away after a restart, the issue is a transient System UI crash — common but harmless. If it keeps recurring, proceed to the fixes below.

Fix 5: Update the Problematic App

App developers regularly push updates to add compatibility with newer screen aspect ratios. If black bars appear only in one specific app and not system-wide, that app likely hasn’t been updated for the S23’s display.

1. Open the Google Play Store
2. Tap your profile icon (top-right) → Manage Apps & Device
3. Tap Updates Available
4. Update the app in question, or tap Update All

If no update is available, the app developer hasn’t added 20:9 support yet. Use the Full Screen Apps toggle from Fix 1 as the workaround.

Fix 6: Check and Reset Display Scaling (Screen Zoom)

If the Screen Zoom level is set too large, the OS scales the UI in a way that can push content off the edge of the rendered area, leaving black borders. Resetting to default fixes this.

1. Open Settings → Display → Screen Zoom
2. Drag the slider back to the center/default position
3. Tap Apply

The S23’s default zoom level is the middle notch on the slider. If you previously bumped it to maximum for readability, try the second-to-last notch as a compromise.

Fix 7: Clear the Problematic App’s Cache

A corrupted cache can cause rendering glitches, including black bars that persist even after toggling full-screen settings.

1. Go to Settings → Apps
2. Find and tap the app showing black bars
3. Tap Storage → Clear Cache
4. Relaunch the app and check

Do not tap “Clear Data” unless you’re prepared to lose login credentials and saved settings for that app.

Fix 8: Boot Into Safe Mode to Isolate the Cause

If black bars appear system-wide (not just in one app), a third-party app may be interfering with the display renderer.

1. Hold the Side Key to open the power menu
2. Tap and hold Power Off until the “Safe Mode” prompt appears
3. Tap Safe Mode to reboot

In Safe Mode, only Samsung’s built-in apps and system processes run. If black bars disappear in Safe Mode, a downloaded app is causing the issue. Reboot normally and uninstall recently installed apps one at a time until the problem stops.

Fix 9: Check for One UI Software Updates

Samsung has released patches addressing display rendering bugs, including black bar issues related to the Android 14 update and One UI 6.0’s burn-in protection changes. Staying current is important.

1. Open Settings → Software Update
2. Tap Download and Install
3. Install any pending updates

The S23 series receives Samsung’s monthly security patches, which frequently include display stability fixes. As of early 2026, One UI 7 is available for the S23 series and includes several display rendering improvements.

Fix 10: Perform a Factory Reset (Last Resort for Software Issues)

If all software fixes above have failed and black bars appear everywhere, a factory reset eliminates any deep-level software corruption.

Back up your data first: Settings → Accounts and Backup → Back Up Data

1. Open Settings → General Management → Reset
2. Tap Factory Data Reset
3. Read the warning, then tap Reset → Delete All

After setup, test the display before reinstalling apps to confirm the bars are gone. Then reinstall apps one by one to catch any that reintroduce the issue.

Fix 11: Inspect for Physical Display Damage

If black bars persist after a factory reset, the AMOLED panel or the cable connecting it to the motherboard may be physically damaged. Signs of hardware-related black bars:

• Bars that don’t move, change shape, or respond to any software settings
• Bars accompanied by dead pixels, color distortion, or flickering
• Bars that appeared immediately after a drop or impact
• Thin colored lines running across the screen (separate issue: AMOLED green line defect)

To check for damage: power off the device and visually inspect the front glass and bezels for cracks. Apply gentle, even pressure across the display face — if LCD artifacts appear under pressure, the display layer is damaged.

Important: Do not attempt to open the S23 yourself. Samsung’s IP67-rated seal and integrated display assembly makes DIY repair extremely difficult and will void your warranty.

When to Contact Samsung for Repair

If physical damage is confirmed, or if all software fixes have had no effect, contact Samsung directly:

• Samsung US Support: 1-800-SAMSUNG (1-800-726-7864)
• Online repair booking: samsung.com/us/support
• Samsung Care+ coverage: Screen replacements are typically covered at a reduced cost ($29–$99 depending on your plan)
• Standard out-of-warranty screen replacement for the S23 typically runs $200–$280 through Samsung’s authorized service centers

The Galaxy S23’s standard one-year limited warranty covers manufacturing defects — if the display developed bars without any physical damage or user fault, Samsung may replace it at no charge. Bring documentation of when the issue started and any steps you’ve already tried.

Quick Reference: Black Bar Fix by Symptom

Symptom	Most Likely Cause	Best Fix
Black bars only in one video/streaming app	App aspect ratio not set to full	Fix 1 (Full Screen Apps) or Fix 2 (in-app toggle)
Black bar only at bottom of screen	Navigation bar overlap	Fix 3 (gesture navigation)
System-wide black bars after app install	Third-party app conflict	Fix 8 (safe mode)
Black bars after OS update	One UI rendering bug	Fix 9 (software update)
Black bars that never move or change	Hardware display damage	Fix 11, then contact Samsung
Intermittent bars that clear on reboot	System UI glitch	Fix 4 (restart)