Maybe it's just my ignorance, but I always find it a little frustrating to click on a merchant or xunlai chest in a very heavily populated town.
I usually hold down Ctrl (or is it alt?) to find them, but it lights up every player character in the area as well. If you try to click on the merchant, you often end up clicking on a player character as well. Sometimes as the hundreds of people huddled around the merchant or chest stream in and out, the position of the merchant tag jumps around, making it a pain to hit.
Don't know if this has been addressed and I am just ignorant to it, or if everyone struggles with it. Not a big issue in lightly occupied places. Maybe having a different key to highlight NPCs as opposed to players would work?
S


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