What is the best icon to show full size / mini-size of 2 components [closed]

thank you for approaching my question.

I have the following side bar that contains two components:

When you toggle one of the components using the top-right icon, it will set the state of the component to closed, and make the second one full height:

The issue

I don't really know what type of an icon I can use there to tell the user that if you close this, the other one will go full height. I don't think that I can even use the minus symbol because I am already using it in one of the components at top-left.