Project Panel won't remain visible

Hi Everyone,

Recently in PP 25.2.3 (Build 4) I accidentally closed the Project Panel.

Now when I open some of my templates, the project panel remains invisible, but is recoverable as a step up one level in one of its sub bins. See photo 1.

I click up one level, get the Project Panel back, then double click the sub bin to get it visible again, and all is good until I close the software and re-open it, then the Project Panel has disappeared up one level again.

I have tried getting it visible then saving the file and saving the workspace, but nothing seems to work.

Any suggstions please?