After purchasing all the troops from a mercenary camp, it would be nice if they were removed from the map and list of mercenary camps on the main tab. On the later levels, we have access to 30+ mercenary camps and they take up a sizable amount of space to scroll through to get the final bottoms ones. After the all the troops are purchased from a mercenary camp they don't serve any use anymore, except just to be in the way.

Already dig sites, arenas and caches are removed from the map when they are depleted, why not mercenary camps also?

+1, the scrolling does get annoying.

Maybe a button like “hide/show empty mercenary camps” could help with this.

Or just have the empty ones move to the bottom of the list.

Sounds like a good idea to me.

Good idea! +1

+1, too much scrolling

Actually a +/- open/close box would be great for all items in each menu.

By default all are open. But hit "-" to close Army Camps so it's just a title "+ Army Camps" then click it again to get "- Army Camps" with the full 20-30 rows.

Same for Hospitals & Mercs and mines & smelters & crafters, etc.

All in all, there is TOO MUCH SCROLLING through the menus in this game. This would greatly improve the usability of the UI imho.

+1 to krinid as well

+1 to Krinid. Good solution to improve the UI.
In the beginning of a game, I upgrade the army camps and hospitals. Mid game I fogbust the map and conquer the remaining army camps and hospitals, upgrading where it's beneficial. So far mercenary camps can be minimized. Mine upgrades usually happen only up to this point.
Late in the game I no longer need to upgrade army camps and hospitals, and can minimize them. Mines too, so it's less scrolling to mercenaries and unclaimed powerups/digging sites.