Try via regedit.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Dwm
Add dword32 ForceEffectMode=2
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I have recently joined the insider program on my windows 10 pro virtual machine on VirtualBox with guest additions on it, and when I open any application it doesn't have rounded corners and maintains the same sharp corners as windows 10, but shows rounded corners in the context menu and the action center even the system tray, can anyone help me with this issue and by the way my windows 10 virtual machine is not activated, is that anywhere related to this because I am given the choice to customize the os
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Try via regedit.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Dwm
Add dword32 ForceEffectMode=2
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Does your virtual machine meet all the requirements for Windows 11?
Make sure the RAM you've given is 4 GB or more and that storage is above 70 GB.
Then try reinstalling Windows 11.