PS CC 20.0.1: 95% of menu options greyed out
Recently updated my PS and when I choose "Edit as Layers in Photoshop" from Lightroom on few photo's I want to stack - they open in PS as normal, but I have no options. If I right click any layers - no options, can't even Ctrl+J duplicate layers, and when I select all layers to align them - The edit menu is largely disabled.

To troubleshoot, I've closed PS, reopened it from the Start menu with CTRL+ALT+SHIFT to delete the local settings file. No change.
Created brand new document. No change.
Unsure what to do from here... So annoying!!!
