reduce padding above Cover block – “Saving Failed”

Hi guys!
I’m using Twenty Twenty Three
I go to Template Parts – Header
I figured out how to put a “Cover” but there’s a space above it where my background shows. I want the cover to be right at the top of the page.
So I click the Cover block, then Styles – Layout
and reduce the Padding to zero
That’s exactly what I want it to look like!
But when I hit Save, it has a pink bar and says Saving Failed.
(Other changes save properly)
Any idea what I should do?
Beg pardon if I don’t answer back immediately as I’m kinda off grid, checking computer occasionally. Thanks in advance!