Question about full games vs trials

Hey guys, just bought a PS4 for the first time. I'm absolutely loving it.

I am using my girlfriend's account and she has lots of games but some of them are not full games. They're just trials etc. I was wondering, how can I tell what games are trials and what games are actual full games?

Sorry if it is a stupid question, I googled it and searched on the subreddit but couldn't get a clear answer.