When I click on the "Validate" button (GREAT addition, by the way! I LOVE the way you list all "unreachable" elements. The only thing missing is a "Delete all" button

), sometimes I get this message that is the reverse of a unreachable element:
This resource is reachable but not present in the OPF <manifest>.
This message was in reference to a font file.
Am I correct in that this message means there is an embedded font in my .epub file that is not being used?
Can I I un-embed the font using Sigil?
Cheers.
Luise