LibreOffice 24.8 abi
Assign paragraph styles to index titles and index entries in Table of Contents, Indexes, and Bibliography. For Alphabetical Indexes, paragraph styles can be assigned to separators. You can also edit paragraph styles from this dialog.
Select the index level to assign a paragraph style.
Select the paragraph style that you want to apply to the selected index level.
Click the Assign icon to assign the selected paragraph style to the selected index level.
Assign
Removes the assigned paragraph style for the selected index level. “Default paragraph style” is used when no paragraph style is assigned.
Opens a dialog for editing the selected paragraph style.