In the Libraries Manager of B4A 10.6 there is a library called AppCompat which is marked as Internal, but if you try to add it to a project you see an error message saying
Could not find file [folder]\appcompat.aar
In fact there is a file called AppCompat.androidx.aar
Could not find file [folder]\appcompat.aar
In fact there is a file called AppCompat.androidx.aar