Help with signpost legends

What is the meaning of a signpost with an X in it? Thanks

Assuming it’s red, I think it’s a hidden open time signature.

I can’t delete it and I’m trying to several bars to form a multirest and I think that may be preventing it.

Does the red X have the “Hide time signature” properly set? If so, what happens if you untick that?
You could also try deleting the barline itself.

Are you in Engrave mode? red X signposts do indeed denote a hidden open time signature, so you need to switch to Write mode to delete it.

I finally figured it out by deleting then adding bars. When I deleted the X signpost before I did that it wacked out the rest of the score in a big way.