I've done some searching and found no answer but I'm not sure if I'm using the correct terms here, so apologies if this is commonly asked.

I have defined some of my own custom control bars and set everything up the way I want. I want to use those control bars in Full Screen mode (which has its own dedicated layout) but they're not available in the menu from that mode. Is there any simple/easy/not overly painful way to copy the custom bars for Fullscreen use?

Note that it's the bars themselves (and they contents) that I want to copy over.