Here are my ideas:

• Option to choose how many tabs can be stacked other than the default 4, you could for example choose 6 and it would add on top and bottom.
• Option for compact tabs (see texture idea I sent you)
• Option to change the name of of the item group based off the tab you're in
• Option to select multiple tabs at the same time or none.
• Option to have sub-tabs (unsure about this)
• Force the tabs to only add items which is in their original tab

Progress Report:

• Option to choose how many tabs can be stacked other than the default 4, you could for example choose 6 and it would add on top and bottom. ✅
• Option for compact tabs (see texture idea I sent you)
• Option to change the name of of the item group based off the tab you're in ✅
• Option to select multiple tabs at the same time or none.
• Option to have sub-tabs (unsure about this)
• Force the tabs to only add items which is in their original tab