All you searched was "User", ignoring case. You didn't search the type of user, so it correctly returned lines with "user" in it like "private var username"
I'm pretty sure you're not doing what you think you're doing because of the "containing" right after the arrow. To search a symbol you usually select it, right click it, and then click on something.
Weird, what was the something you clicked? It may be something wrong with that button instead of the search function, as there's "containing" after the arrow so it's not really a symbol search.