Red border is a Mouse Screen Lock feature in League of Legends
Feature locks mouse cursor within game window for multiple monitor use
Quick Fix
Press F9 key to toggle Mouse Screen Lock
F9 again to remove border
Hotkey Rebinding
Access Practice Tool to modify settings
Navigate to Hotkeys section
Change Mouse Screen Lock binding to preferred key
Additional Troubleshooting
Set game to Fullscreen mode in Video settings
Update graphics drivers
Modify game.cfg file to set WindowMode=0
Check screen resolution settings
Repair or reinstall game if needed
Yanıtı değerlendir
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