Go to Manage / Environment / Administrations. Then click 'Edit'. Enable or disable 'Administration is not VAT liable' in the tab 'Properties'.
In administrations that are not VAT liable, booking proposals are created without VAT and it is allowed not to select a VAT code in a booking.
It is also possible to change administration settings in bulk by selecting multiple administrations and then choosing 'Edit' via the bulk action.
Point of attention
Only with Twinfield, Exact Boekhoud Gemak and Multivers this field is synchronized when adding a new administration.