You can turn highlights from others off on the Kindle, I’m guessing the same for Libby books. The highlights only show up if there’s enough of them. So if 100 people highlighted the same passage it will show up underlined on your kindle. If only you do it, it doesn’t affect the next reader to borrow that book at all.
You can also search for your highlighted passages on the kindle. It’s not an intrusive feature at all but whether you use it is up to you if you find it helpful.
You can turn highlights from others off on the Kindle, I’m guessing the same for Libby books. The highlights only show up if there’s enough of them. So if 100 people highlighted the same passage it will show up underlined on your kindle. If only you do it, it doesn’t affect the next reader to borrow that book at all.
You can also search for your highlighted passages on the kindle. It’s not an intrusive feature at all but whether you use it is up to you if you find it helpful.