Currently unable to access right-click menu (for last/second-last layer), or background colour dialog ..
These are blocked by non-working NEW 'Themes' dialog box, which can NOT be banished or moved. Clicking on opens full screen dialog ('Coming Soon', have credit card ready ..), and closing that reverts to initial state.
This is likely not an issue for any design with less than (estimate only) 14-15 layers. As you could scale down page to work around.