You must be using filemaker 11 or older. Newer versions no longer use // as the date symbol in layout text. One "fix" for your situation is to put a space between the two // and then select that single character and specify a 1 point font size.
That's exactly what I did yesterday. I made the space in between a smaller font to close in the gap. But I was hoping for a more efficient solution, like an escape key shortcut for when I have to do this again on future forms. Thanks. You helped me to see that I was on the right track.