The fact you can search via number of assemblers is really nice! Keep it up! If you haven't already you should check out the Factorio discord as well :P
One suggestion would be to have its current state stay when you turn off and back on your interface.
Thank you, it was already on my list, but I was thinking more about the "what is it used for?" style where you would pin the data of a certain tree to the side of the screen. So you can open that specific tree with that button. My only concern is the usage of even more screen space.
