Regarding the issue of configuring the Windows 10 Start Menu

[SzheC]

After setting it to the Windows 10 Start menu, the Start menu cannot be opened

[pyrates999]

duplicate of: #4628

your third party antivirus is blocking it, you need to add the exclusions to it according to that issue.

[vippium]

After setting it to the Windows 10 Start menu, the Start menu cannot be opened

Give a try to clean Install ... As I'm on 24H2. Maybe you're using 25H2 on Release Preview.

But before that .. keep a backup of your settings. And let me know if this works.