how do i go eva from different parts?

[minerbat]

On the top of the screen there are 3 seats displayed, and if there are kerbals there you can click them to go eva from that part. but on the ship that i have all those seats are in parts that have obstructed hatches. i have another part with an unobstructed hatch, but i can not figure out how to make kerbals go eva from that part. i know how to move them to the part using the kerbal manager, but i can see an option to make them go eva. also clicking on the part or on the hatch like in ksp 1 doesnt seem to work.