win11-toggle-rounded-corners is a simple option for disabling window rounded corners on Windows 11 without manually performing the change. win11-toggle-rounded-corner does not replace any system files; it works by setting a bool inside the heap of the Desktop Window Manager (DWM) or, to be more precise, inside the udwm.dlls singleton instance of CDesktopManager. If you want to permanently disable rounded corners, put the app into your auto-start. Everyone has their taste when it comes to appearance; some take what is provided as the default, and others want to change everything back to what they are comfortable seeing. win11-toggle-rounded-corners does this in a snap; download, run, and done. There are other options to perform this change manually, but we here at MajorGeeks like to offer alternatives and support small devs. Similar: MajorGeeks Windows Tweaks