ArcGIS Pro is really unfriendly to small screens, even when maximized. Here, I have a student trying to build a label class with existing fields. Even after I showed her how to collapse the ribbon (originally the fields were showing one at a time with no scrollbar), she's still having to click in an impossibly tiny window to sort through the field names.

In ArcMap, the window is laid out better; there's much less wasted vertical space and plenty of room.
