Don't know if this is the same in Joomla 3 but in Joomla 4.1.2 if you add a Feature Box there is a problem with the settings window that comes up.
The field under Title Margin Bottom displays as:
COM_SPPAGEBUILDER_ADDON_FEATURE_BOX_TITLE_URL
and the description underneath it displays as:
COM_SPPAGEBUILDER_ADDON_FEATURE_BOX_TITLE_URL_DESC