The current inventory filters are nice and all, but for Extreme Condo Decorators™ who hoard almost every type of item, it’s pretty hard to get a quick glimpse of what kind of items you have to choose from.
Additionally, given it’s long length and short height, it feels rather cramped. Its longer size means you have to scan it horizontally to look over every item in the menu, but the lack of any vertical height makes scanning it inefficient; you could easily look over 6-8 rows at a time, but are limited to only 3.
Anyways, as shown in the above images, there should be a button on the inventory menu to expand it to fill up a greater portion (2/3 to 3/4, maybe larger) of the screen. Clicking and dragging an item would minimize the menu, as is currently the case.