Since your GPU is not doing much, you can use its fans while your CPU is cooking something, you can override what the GPU fans are doing with afterburner 
for the duration of the cook:
But seriously, just ensuring the case is well ventilated and not sucking hot air from the room radiator is a good start. You could underclock the CPU but you generally do not want it to go slower. People do all kind of strange things to keep temps in check.
whenever i’m clicked on unreal engine my gpu usage goes WAY up due to for some reason desktop window manager using a ton of it and i have absolutely no idea why, is that normal?
If it’s a spike and then it goes away, it’s normal. Is it the 3060 that you see being used in the Task Manager?
Do note that the editor is using the GPU all the time, it’s just does not need a lot when you connect wires together. If you were to work with graphically intensive stuff, it will be underload all the time.