How do you get overlapping items to move sideways?

I've always wanted to make something like this, but I've never found a way, how to make overlapping objects shift automatically in random directions/closest distance?

This also applies to enemies that collide with each other.

I don't know what keywords I can search on the internet to find the tutorial part.

can anyone give me help?

Give them a push: dropbox.com/s/4tjnro8xiy4j6tm/sesame_instance.capx

or

Pushing away from obstacle example: dropbox.com/s/elew687p4kdy9of/Avoid_Obstacles_PUSH.capx