I think lots of people have already said most of this but, having been a manager in the past and now happy beyond words that I'm just an ordinary team member...
Enough staff to do the job
Enough resource to do the job and not always buying the cheapest
Decent IT
Awareness that some of the top managers' pet vanity projects might have to be sacrificed or put on hold for a bit if the last two aren't possible, or even, God forbid, assessed to see if they're actually necessary at all
Getting managers to set realistic deadlines and expectations with the resource available
Minimising favouritism and getting managers to understand what people actually do is at least as important as what they're seen to be doing/tell everyone they're doing
Making sure it's not always the same people who have first dibs on holiday, for instance
If pay is an issue that can't be improved then whst else could be done - flexible working, TOIL, home working, making sure people are able to take their lunch
Allowing everyone to have their say even if the introverts in the team need to feel safe before they can - not making people talk in front of others if they're not comfortable but gaving suggestion boxes or similar
Minimise pointless meetings; I've worked in way too many places where managers seem to think the more meetings they have the better a manager they are and the work will just get done by the work Fairies as the managers have NO CLUE how long anything takes (yes, HE, I'm REALLY looking at you)
Second, third and fourth the previous comments about don't have stupid awaydays every other week (I could write a book just on that). Athough I'd definitely be a fan of the back to the floor approach for managers...
That staff are human not robots and life doesn't run in a straight line and unexpected things happen - still astonishes me even after COVID-19 that there are people who don't get this
Quiet or thinking space
Decent basic facilities - coffee rooms, loos, parking etc
Managers not micromanaging and understanding just how much work can be done from home; and for some jobs, does it matter if it's done between 2pm and 10pm as long as it's done? Why does EVERYTHING have to happen between 9am and 5pm?!
All the yoga initiatives in the world won't help 8f ths fundamentals aren't there to start with
And back to...enough staff to do the job or getting managers to understand what is and isn't possible with the resource available