Booklets
Drop a PDF and get fold-and-staple sheets: pages paired for folding, the sheet picked at twice your page, duplex set to flip on the long edge.
A4 pages become A3 sheets, Letter becomes Tabloid. Landscape is chosen when the pages ask for it.
Saddle stitch or perfect bound. Blank pages are added so the last sheet is never half empty.
Thick booklets push inner pages outward; the creep field compensates, and you can set it by hand.
The defaults come from your file. Change a setting and the proof updates before you let go of the mouse.