Hi @מתן יוסף ,
Thanks for posting in Microsoft Q&A.
You can disable Microsoft Edge Rounded Corners using the Flags page.
Please update your Edge browser to the latest version and follow these steps below:
- Open the Microsoft Edge browser
- Enter "edge://flags" in the address bar to open the Flags page or Experiments page
- Use the Search box to find the Microsoft Edge rounded corners option
- Select the Disabled option from the drop-down menu
- Press the Restart button
Now you will see rounded corners disappear in your Edge browser windows.
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Best Regards,
Raina Zhao