[UMG] How to stretch canvas panel to fullscreen?

I dont see any Anchor property inside Canvas Panel.

I need to stretch it to fill fullscreen.

I’ve added horizontal box inside canvas panel, and stretched it to fullscreen. I donno though, if its correct solution.

To anyone else that runs into this problem, I just stretched the element to fill the screen, and then set the anchors to the corners of the screen (so that it resizes correctly) - it would seem that only direct children of the canvas have an anchor.