Dual Windows - how to drag from one to the other?

[dragoro]

Saw it in videos but can't remember how to do it. Or am I imagining things?

 

[mrwallyy]

Tap on the circle in the middle then choose the circled icon:

 

[eve6er69]

Wallyy is correct. It's the old switcheroo lol

Sent from my gameboy color