I have a backslash in a web address. The address can fit on one line, but when there is a backslash in it the address is unnecessarily split up onto two lines. I hid the text field and checked behind it to make there there weren't any objects moving it around.
Highlight the URL, and go to the flyout menu of the Character panel and select No Break.
Thank you for the prompt response!!!!!
Remember, though, that that can cause bad linebreaks or oversets later when you edit and the position changes. I suspect the reason it's breaking is the paragraph composer is trying to give you a balanced line ending.