Forget I asked this, I just found the answer myself after taking several deep breaths :-)
Sorry to have bothered you all
Please never hesitate to ask questions or to ask for clarification. Great job defining your Elements Organizer 12 Cltrl+1 happening.
I did not realize that Ctrl+1 would delete still images from the Elements Organizer. So that sent me looking for documentation. I still have not found mention of this particular shortcut in Adobe documentation, still looking.
However, I did figure it out, I think that I have, that your issue was not a "removal from the catalog issue" but rather a viewing issue.
In Elements Organizer 12 View Menu/Media Types see what the keyboard shortcuts toggling on and off is all about.
Ctrl + 1, Photos
Ctrl + 2, Videos
Ctrl + 3, Audio
Ctrl + 4, Projects
Ctrl + 5, PDF
Interesting question. By the way, did your Elements Organizer come along with Premiere Elements or Photoshop Elements?