Although you are now able to select which DLC you want to use with the filter system it still needs IMHO a few more tweaks.
#1 Would be extremely useful if you could favourite a building piece, a foundation type from any DLC or wall etc and have it appear at the top of the inventory crafting selection, this would make building with multiple DLC’s a lot less fiddly than it is at present.
Just highlight the piece you want, press X to favourite and X again to remove it from the selection.
#2 Have workbenches, chests / cupboards and the player inventory remember which DLC was last selected separately, each workbench type to be independent of each other, EG when using the artisan bench it does not show the selection from the blacksmith.
As I own all the DLC’s the filter system is much, much better than it was but I am still wasting a lot of time having to filter every timer I enter a different type of workbench.