OK, good attempt, but You are using the Feature Callout here (%HC) which itself is a summary of several other feature references.
So You have to switch over to the real HC settings and from there You can format it as You like
OK. Or here:
Thanks, my friend. I've never used this feature before. You may have been able to tell.
only click into one callout text field, this again should show You the formate button for it.
I get it.