Great! You Got IT.

The Bitmap Gallery only lists the default Xara bitmap and those bitmaps currently in the open documents (drawings).

I think you can add bitmap images to a folder so they will be there at all times. I'm not sure where that is on the Linux version. I'll check when I'm home later today to see if I can identify the correct folder. That is if I have electric power and a home, we are in a tornado warning for the next 4 hours.