The display glitch appears after using Smart View; here’s how to avoid it until Samsung rolls out a permanent fix.
One UI 7 Update Causes Black Line Bug on Flip Devices
Samsung’s One UI 7 update brought a host of new features, but it also introduced an unexpected issue for some users.
- A black line appears on the main screen of some Galaxy phones—especially the Galaxy Z Flip series—after using the Smart View feature.
- The glitch shows up after mirroring the screen to a TV or external display and folding the phone, particularly when Smart View is set to “Full screen on connected device.”
Samsung Responds: It’s a Known Bug, Fix Coming
Samsung has officially acknowledged the issue, calling it a software-related glitch specific to foldable phones like the Z Flip 6.
- The issue is not hardware-related, and the company has confirmed that a software update is in development to resolve it.
- The bug is triggered when the user folds the phone to end Smart View, causing a temporary black line to appear on the display.
Temporary Workaround: Change Smart View Settings
Until a permanent fix is released, Samsung has shared a simple workaround to avoid triggering the bug:
- Open Quick Settings and tap Smart View
- Connect to your display device
- Tap the floating Smart View icon
- Go to More Options > Settings
- Change the screen ratio to “Full screen on phone“
Additionally, don’t fold the phone to disconnect Smart View. Instead, use the pop-up disconnect button to end the mirroring session.
How to Install the Fix When It’s Released
Samsung will include the permanent fix in an upcoming One UI 7 software update.
Once available:
- Go to Settings > Software Update
- Tap Download and Install
- Follow the prompts to update your device
If the black line persists after the update, users are encouraged to contact Samsung Customer Support for assistance.
Final Thoughts
While it’s a minor but annoying issue, Samsung’s quick acknowledgment and the provided workaround should help Galaxy Z Flip users manage the glitch.
A fix is on the way, but until then, adjusting Smart View settings is the best way to keep your screen clear and functional.
