File sharing blocked by AVG Internet Security

I have a Win11 desktop and a Win11 laptop on a home network. The desktop runs AVG.Internet Security 25.3.9983a on subscription.
Connections from the laptop to shared folders on the desktop are blocked. ("Windows cannot access \Desktop, with error code 0x80070035)
Disabling AVG on the desktop immediately gives the laptop access to the shared folders, and re-enabling removes access again.
Some other posts on this matter refer to items/menus in the AVG IS interface that are not on my version.
Any ideas?