Unknown red (bar?) line in my score (signpost?)

I somehow created a redline in my score that I cannot paste or copy across.

Can someone tell me what it is and how to delete it and the signpost beside it indicating time signature?

Thank you in advance.

Frank Wallace

Welcome to the forum, Frank.

It’s the Insert Mode Stop Position. See Deleting Insert mode stop positions


You can just select it and hit delete.

I know it’s tardy, but thank you for your replies.