Tab menu - "set" button is greyed out!

I am trying to set my tabs with the dotted leader character.  However, when I highlight or select the paragraph and access the tab menu, the "set" and "clear" buttons are greyed out.  I've tried numerous things to get this to work, but no luck.  How do I get the "set" button to work? 
Thank you,

Question Info

Last updated June 30, 2019 Views 1,057 Applies to:
Did you remember to set at least one custom tab position? Note that you can't define tab leaders for the default tab stops.
Stefan Blom
Microsoft Word MVP
Volunteer Moderator
Note that MVPs do not work for Microsoft
MVP program information:

Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.