So I'm trying to set logistics limits for my character, but if HandyHands is crafting something, everytime it initialises a craft it closes the menu and makes it hard/impossible to set logistics limits for my character while HandyHands is autocrafting already. So if I want to set autocrafting for handyhands I have to empty my inventory of the ingredients I'm adding or I have to wait until HandyHands is done with what I added, to add the next thing.
That's a Factorio bug. I don't remember if I reported it to the devs though but I think I remember this issue being brought up before. Nothing I can do about it. Instead of emptying your inventory you can just pause HandyHands, should be easier. Use the shortcut or just cancel the handcraft and HandyHands will pause automatically.
It also seems like the stack amount to autocraft option does nothing, it always crafts one item at a time, whether I say 20 or 100 belts, it does one single belt at a time. Unless I'm misunderstanding the stack amount to autocraft option, it doesn't seem to be doing anything. Perhaps the first issue would be mediated if it didn't craft one at a time (since it seems to close the menu whenever a new craft is created)
It always crafts 1 thing, that's intended. This way the mod can always react to what is needed the most at the moment and craft that item. Putting 20 things in your crafting queue would just be annoying since if you start picking up things or need something else more then you need to cancel the queue all the time. And there's no advantage to having more things in your queue.
The setting is for how many items to "request" for autocrafting. When it reaches this number no more things of that type are autocrafted.