Is it possible to clear the editor memory once we run and load a soft reference?

Hi! I want to know if possible to clean Editor memory and why memory keeps busy once for run your game and load some soft reference and stop the game.

I start a fresh editor session with a test project with soft references…check memory with obj list and nothing is there…run the game, stop it, check again…soft references are loaded and in memory…only way to remove it is just exit and running the editor again?