Party management is a mess in and of itself, try re-arranging the portraits. Yeah good luck, want to slot in #4 into #2? Not happening. Gotta disconnect the person from the party and THEN slot them into #2.
Clicking a party members portrait to select them? Gods. I tent to click on a party member and hit the 1 key to use potion for healing, half the time it doesnt select the person. I've had a couple instances where I had to double back and realize the character wasn't selected and its a bit annoying. Why clicking the portrait doesn't register as a selection more often than not is both clunky and annoying. F1-F4 options are nice to select, but they should be options not a requirement to have it be responsive.
I never understood why click drag selection didn't exist in DOS1 or DOS2, and that its absent in BG3 is even more confusing.
Barely related, but god if they didn't manage to make even the "initiative queue" look way more confusing than it should have any right to be.