Let’s talk TIle layout. When you first introduce Devices into HV using the “multi-room” Wizard, you wind up with N “Room” tiles placed on the Default grid in this fashion:
with all of them stacked in the first column (followed at bottom by the “Go Back” in each “Room” dash), which I’m calling a 1xN layout.
Once the Wizard knows your intention of having C columns (I like 5, but I bet most people use 3 or more), I’d prefer it to arrange the “Device” tiles on the DEFAULT grid in this order:
    
  
…and on subsequent room grids as:
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with “Go Back” consistently at the upper-leftmost position (c1r1).
Why? Firstly, because a Default grid with all 16 “Rooms” in a tall tower in Column 1 looks a bit awkward while Columns 2-5 stay empty. And, secondly, because unless the “Go Back” tile is automagically kept at or near the top of each grid, it winds up being “different places” (i.e. inconsistently located), perhaps at the bottom of that 16-tile stack of device tiles!
Hoping I’m not the only one seeing this and thinking it could go differently. I’ve been quasi-OCD about icon arrangement since Windows 3.0 (even led me to invent a silly pseudo-mathematical “proof” about rectangular arrangements in the early 1990s, lol).