What the website looks like to visitors

The white header in the photo above does not appear in my editor. Its a sticky header, which is what I want the black one to be, but I cannot set the black header to sticky either. The photo below is what I see in the editor. I cannot select where it says home, it doesn't recognize it as a block, double clicking doesn't do anything either. This site editor has given me quite the headache, any help is greatly appreciated.

What I see in the editor

What the website looks like to visitors

The white header in the photo above does not appear in my editor. Its a sticky header, which is what I want the black one to be, but I cannot set the black header to sticky either. The photo below is what I see in the editor. I cannot select where it says home, it doesn't recognize it as a block, double clicking doesn't do anything either. This site editor has given me quite the headache, any help is greatly appreciated.

What I see in the editor