Hi Bernard, this can simply be done by adding a "level" shape data item to the shape or page, see https://docs.dataminer.services/user-guide/Basic_Functionality/Visio/miscellaneous/Making_a_shape_or_page_visible_only_for_a_particular_access_level.html

This will apply the same security logic as for other items in DataMiner, so if a user is included in 2 security groups, they will be granted the highest security rights of those 2 groups.