Collapse All Shortcut in Mindmap

I like taking notes in form of mindmap. This way when I’m revisiting these notes, I want to step by step unveil the nodes so that I’m not overwhelmed by the entirety of it in the beginning. Currently, I have to collapse all the nodes one by one to do so. It would be great if there was a keyboard shortcut of some sort to help me out with this. Hope it makes sense :smile: