Organizing sprite selector

I recently imported a big batch of animation sprites to my project and ran into the following problem: When I try to select a sprite for Image component, not all of my old sprite assets will show up on the list. I assume there's some maximum limit what the list can show.

Does anyone have ideas how to solve this? Currently the sprite selector list shows a lot of unnecessary animation sprites but hides the important UI assets. I can still select specific assets by searching for them, but that doesn't really work if I don't know already what to pick.