If the Table Based User Interface Defaults for the table do not already exist within the user's schema, they are defaulted. If they do exist, they are synchronized, meaning, the columns in the table is matched against the column in the UI Defaults Table Definitions. Additions and deletions are used to make them match.
APEX_UI_DEFAULT_UPDATE.SYNCH_TABLE ( p_table_name IN VARCHAR2);
Table 34-8 SYNCH_TABLE Parameters
The following example synchronizes the UI Defaults for the
EMP table that are associated with the current schema.
BEGIN apex_ui_default_update.synch_table ( p_table_name => 'EMP' ); END;