How do I drag this dashed line help me please

How do I drag this dashed line down? It’s really annoying, I put it at the top for some reason now I can’t get it down, can anyone help me?

Just drag it up and down?

But I can’t don’t you get it? I know it’s that simple but it is undraggable

I save the page I’m editing and when I come back it freely moves again :frowning:

Well not at me, any idea? I already saved the draft and refreshed and still doesn’t work. I also changed my browser, nope.

Can anyone help me?..

Tried reset/change template?