@foo they are located like this for the excellent docking station (combined cable that plugs in USB C and power connector). The excellent docking station features as well: screen detection roulette (1, 2 or both?), data connectivity roulette (great if the mouse/keyboard are connected via the docking station and typing text just randomly stops and its necessary to open the laptop lid, rearranging all the windows...). But all of this can be solved with one, or two, short unplugs or a reboot.
Edit: ok on your unit the port back there is just an USB-A. But who needs these nowdays? I am sure you upgraded to a USB C mouse by now?
@foo The thing you're plugging in looks pretty antisocial in terms of port blockage.