Save grouping options per tab
I have noticed that certain tabs that i created work better with certain types of grouping selection. I would suggest tabs to save the grouping state and switch it automatically on each tab switch.
Eg.
I have a database for deliveries. I have a tab with pending orders and a tab for cancelled orders.
I find the tab with pending orders to be more useful if grouped by Drivers, so i quickly see how many orders are pending per driver.
The cancelled tab on the other hand i find is more useful if grouped by date, since I dont care who the driver was rather than when the order was cancelled.
So when i switch between them it should group automatically.