If we select some page on a page and do not deselect it, I cannot select text on another page. First, I have to go to the original page deselect the page by clicking elsewhere, and then select text on another page.
I use GoodNotes on iPad when I want to write something, but for just reading and highlighting, and underlining I use the monitor. I feel the experience on the macOS app related to highlighting and underlining can be improved a lot.