It would be awesome if we could filter the raids by level. I don’t do mythics, so it would be nice to have like a check listbox to select the levels you want.
You can do this!
At the top-middle of the page in the main toolbar, click the filter button (looks like a funnel) that is just to the right of the gearing strategy. In there, you can choose which raids, bosses, and difficulties you would like the upgrade finder and per-slot item lists to contain.