I broke "Title 1" no longer showing in my ToC for some reason

I changed my Title 1 font type, size and spacing, no weird things. Now Title 1 is no longer being considered when I generate/update my ToC I also noticed some fields are now unlocked, where in another document the Title 1 relative fields are indeed locked.

This is what I see in the working Title 1 document

This the corrupted version in another document

Please share a little sample file containing the problem. - Cheers
Question: Do you mean heading 1 style when you write “Title 1”?
(Livello 1 seems to be heading 1 in English.)

1 Like

Correct, for some reason my Outline Numbering messed up.

Panic mode off, I found this and solved: LibreOffice Writer: Why did heading 1 and heading 3 disappear from the table of contents?