It wouldn’t take up anymore space on the PC than it does on the Mac. If you want to have the inspector windows floating over your workspace, you can move the tray. You can make as many trays as you want so if you want one just for the Scrapbook, make it. You could also move the tray(s) to a second display and make them larger.
If you are making your own scrapbook entities, lay them out on a page in LO and make sure they fill the paper space. If needed, reduce the size of the paper to fit tightly around the scrapbook entities. Here’s a quick example.
Arrows on letter size paper.
Saved as a scrapbook:
Paper size reduced:
Saved as Scrapbook.