How to fix a bottom nav to the bottom of the frame in Design view?

How do I fix a bottom nav to the bottom of the frame in Design view?
I’m often being asked to remove or add content to a page design and have to keep adjusting the length of a frame. It would be handy if the bottom menu were somehow fixed to the frame’s bottom. I’m not referring to prototyping here but trying to assist with designing. All the best Rob.

Hi tank666, I think I’ve done what you suggested, then dragged down the frame but it didn’t stick to the frame. Where have I gone wrong?

Did you hold down Ctrl while resizing the frame?
If you did, then you don’t need to do it.

I held down the ‘command’ key which seemed to neutralise things. However you are correct, if I just drag the frame bigger the bottom menu does stick, so thank you very much for your help.