Resize the panels
Every tray - photo library, spread timeline, templates - can be dragged bigger or smaller to suit what you're doing.
Starts at 10:42 in the full tutorialWatch on YouTube
More in Interface & panels
See all 11Close panels for a bigger canvas11:07Move the photo library to the bottom11:38Full screen photo library1:02Remove photos from a spread in full screen photo library2:04Reset panels to their default positions10:05Switch between light and dark mode10:11Focus mode: hide every panel at once46:58View the book as a slideshow41:36Show proofing numbers on canvas45:02Toggle header view from vendor book to project name59:15