Hi How do I delete resources I don't use?
It's called "Hiding" books (it actually removes them from your hard disk, but you still retain the license to them in case you change your mind later).
Here's how to do it: http://wiki.logos.com/Hiding_Books
excellent... is there a way to delete lots at once, or entire collections? I downloaded the Perseus Collection but find it a real hassle...
The most you can currently hide at one time is 10 (there's a link in that wiki page to the forum post with the explanation of the trick for how to hide 10 at a time, but it's easily overlooked; here's the post. There's a request in to Logos to allow us to hide any number of books at a time, but they have not promised to add that capability. However you can vote for it at UserVoice and the more people want this, the more likely it will be that Logos will listen and give it to us.
EDIT: By the way, if you decide you don't want any of Perseus anymore, you can contact Customer Service and ask them to remove the license from your account.