Hey Ahdung,

Thanks for reporting that one! We've tested the latest Windows version of Fiddler Everywhere (now version 1.4.0), but we could not reproduce a borderless UI (see the screenshot for my test on Windows 10). Could you please verify that you have the latest version installed and if the issue is still there after a restart of the application?

If you still see this one, please let us know the exact version of your OS and let us know if there are specific steps that we should take for the problem to appear.