I hope in v1.6 we could re-include a good starter room for Xsheet centric usage (similar to the old Basics one), but for now you can create your own "Basics room", if you like.
Just go over the rooms tabs and perform a right click, choose to create a new empty room. Then start opening the desired panels from the Windows menu and dock them anywhere you like to have them placed.
That's all.
Luck!
g
Tip: When building a new room from scratch, it's useful to NOT have the program maximized, as it helps in placing panels at the right/left most borders of the window.