Since this issue occurs not only when using Microsoft Edge, it suggests that the Microsoft Edge WebView2 Runtime is causing problems when third-party applications attempt to utilize it.

The cluttered, heavy design has been streamlined into a cleaner, more intuitive experience, writes ARTHUR GOLDSTUCK.

This tutorial shows how to turn on or off rounded corners in the Microsoft Edge browser on Windows 11/10 PC. You can turn on or off rounded corners for browser tabs ...