It works like a day of the week hand rotation to me. Putting it in place of the minute hand rotation tag, the hand points to the same place around the outside edge of the watchface corresponding to the weekdays. So, the DWR could stand for Day Week Rotation.
I use Facer creator exclusively on tablet. In order to get the most out of this feature you really need to lock all elements and leave unlocked just the elements you want to group select. Once you have done this hold and drag to select area on watchface (tip: zoom out and select everything - only unlocked elements will be selected), I use a stylist pen but your finger works too. I can select all unlocked elements. However, the selected elements are not initially highlighted in the elements list. To highlight them i have to move the items (seems like a bug). But i can confirm that even when they are not highligted if i hold and drag an element from the list which i have selected, all items are moved together. Best to have a play with this feature in a new design, use a facer template to get familiar. Now that i know how it works it definitely is useful.
Apologies for the low quality gif…Facer limits uploads to 4mb!
I use a Samsung Tab Ultra S8
To deselect all just select one element from the list of elements. You cannot just deselect one (maybe on pc you can?). But on tablet you just lock items you don’t want to select then drag an area to sekect all unlocked items
