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In DB find table prefix_postmeta (use prefix, you selected on install)

Than in that table find relevant records:
select * from prefix_postmeta where meta_key=’_menu_item_languages_show’;
select * from toskana_postmeta where meta_key=’_menu_item_languages_type’;

Records would probably have NULL in meta_value column.

Update with right keywords for example:

update prefix_postmeta set meta_value=’both’ where meta_key=’_menu_item_languages_show’;
update toskana_postmeta set meta_value=’dropdown’ where meta_key=’_menu_item_languages_type’;