So as far as I know there is no such feature in game.
I am a newbie player and the most frustrating thing is after defending my territory from enemy I get 35 idles. Some of them In building some of them just standing. Some of them are trade carts. Some of them are fishing ships etc.
I think there is a hotkey to select idle trade carts but I am not talking about hotkeys. I am talking about the clickable idle villager button. Right now if you want to find your idle trade carts after a chaotic raid, you either have to search the map, or you have to click the idle button 25 times to find that 2 idle trade carts. (As far as I know)
Maybe like this?
Shift click for next idle trade cart
Ctrl shift click for all idle trade carts