Program & Reference Monitors keep going Full Screen.

[mandicreally]

So I'm not sure if this is a bug or some setting I'm missing here, but Premiere keeps going Full Screen CONSTANTLY. I have to use the keyboard shortcut to make it come out of Full Screen (Ctrl + ~). 

My PC is setup with 4 monitors, 3 of which I use for editing in Premiere. One of them is just for my Program Monitor (a 4k Dell panel). My Reference Monitor panel is on the same screen as my Timeline. However whenever I go to my Reference Monitor and start scrubbing footage in there, it ALSO appears on the 4k monitor & goes Full Screen. Then when I go back to editing my video in the timeline, the Program Monitor remains in this Full Screen until I use the keyboard shortcut to go back to a windowed view. 

Here is a video of it in action: 
https://www.youtube.com/shorts/LetTZDfykZ4

This just started today out of nowhere. I did make some computer changes today but I cannot see how they've caused this. Namely I setup a new camera & installed some NDI software to support that. When I reloaded Premiere the first time it oddly defaulted to trying to output my video playback over NDI, so I had to go in and disable that. Once disabled this Full Screen bug thing started. 

I can edit my videos and work normally but if I want to reposition footage or access something on the desktop behind the Program Monitor I have to get it out of Full Screen. It is absolutely infuriationg to keep having to keyboard shortcut every 30 seconds. Any input is appreciated.

[Peru Bob · Accepted solution]

Try resetting the preferences:
https://community.adobe.com/t5/premiere-pro/faq-how-to-reset-trash-preferences-in-premiere-pro/td-p/...

If that doesn't work, try resetting the Workspaces:
Reset a workspace
Reset the current workspace to return to its original, saved layout of panels.
1. Do one of the following:
• Click the Workspace menu icon and select Reset to Saved Layout.
• Choose Window > Workspace > Reset to Saved Layout.
from here:
https://helpx.adobe.com/premiere-pro/using/workspaces.html

If that doesn’t work, try updating or rolling back your graphics driver directly from the video card manufacturer’s site. If NVIDIA, do a clean installation of the latest Studio Driver (NOT the Game Driver).

If that doesn't work, try creating a new project and import the old one into it.

[mandicreally]

Thanks, a preferences reset fixed it. I have no idea what changed to cause that, but a reset worked. Should have remembered to start with that after so many years on Premiere.