If you have alot of different items in your inentory its maybe a bit harder to manage, but they can maybe add like a search bar like you have in minecraft creative inventory, or if you have alot of items, then the slots with the items will get smaller so it can fit on you screen!
A other option is that they can make 1 slots with: blocks, and if you click on that, you can see all the block in your inventory and move then to your hotbar.
