It would be much easier to manage spells and abilities, especially once higher levels are available, if clicking on the resource indicator (e.g. the spell slots list, channel divinity, superiority dice) on the character action UI brought up a list of all available ways to spend that resource. As currently implemented the hotbar that is used for both items and class granted abilities gets quickly filled up on spellcasters with their spells leaving little room for items.
Also, I may have missed it, but there does not appear to be a way to see what Warlock Invocations you've selected.
As an aside: if you're going to be changing classes around, Warlock's Hex may as well be made into a level 1 class feature rather than a spell.
