Have you tried the operating manual page 44 or page 95 way???
I get the space ONLY on the last valid digit of the entry. Inbetween - no spaces. So you have to delete from the end to the front... :headbang
I went to the last valid CHARACTER of DIGIPATH 3, where I had entered WIDE2 - 2. I first rotated the dial to eliminate the '- 2' so that I was left with WIDE2_ where '_' was blank or a space character.
I pressed BAND to backspace and was now on '2'. I rotated the dial counter clockwise and found a space character. I pressed BAND and '2' was replaced with '-'. I continued until all characters I entered were replace with '-'