Oh, it's a mod, Favourites, https://steamcommunity.com/sharedfiles/filedetails/?id=2720562164. It basically lets you manually tag any object in the game with little stars or trash cans.

Basically, whenever a big raid comes in, I use the Numbers mod (with traits coloured extension) to select who I want to recruit, then tag them with the Favourites mod so that I know to hit them with a shock lance.

Similar process but different star for enemies with nice armour or bionics, or ones with superweapons or low shield packs so that I know who to kill first.