The simplest way to remove rounded corners without installing software is through High Contrast themes. These themes prioritize visibility over aesthetics and naturally force square borders across the UI.
ExplorerPatcher is a powerful tool primarily used to restore the Windows 10 Start Menu and Taskbar in Windows 11, but it also includes settings to disable rounded corners. how to disable rounded corners in windows 11
Just keep a system restore point handy.
Here are the best methods to disable rounded corners. The simplest way to remove rounded corners without