Thanks !
I based it off pharaoh which is the second game made by the dev of Caesar III.
You can pan around the map with the left clic button, I should have indicated that somewhere since it wasn’t clear.
There is a randomisation ! Kinda.. tl;dr when a people exit a building he will randomly choose between every production building within 600 range of the actual building.
However as other review said, the mechanic wasn’t clear enough so that’s a point I will be working on.