Quick Clue - Image Frame #30n30

Image frame removes the boarders from all existing images in your drawing. The bad news is if you need to edit the image, you will need to change the settings back.

Command: _imageframe
0-turns image frame off
1-turns image frame on

There is also the same kind of command for PDF files.

Command: _pdfframe
0-turns PDF frame off
1-turns PDF frame on