It's my understanding that the art library search in the sidebar should return things from your purchased content before it returns premium content that you have not yet paid for. Generally speaking, it does seem to do this. But if I put in e.g. the term "human", I only get premium content, despite the fact that I have bought quite a number of tokens that are tagged "human". Given that the only way to search the tags of your purchased content is using this search (the tags don't carry over into your library), that makes it extremely difficult to search content that you've paid for in a lot of cases, which is starting to put me off paying for content on the marketplace at all....