Conditional with single checkbox

SOLVED : change type checkbox by [acceptance] equal to 1

This will work with a single checkbox too. You could even take this further and only show a group when a specific amount of boxes has been checked. Example: https://conditional-fields-cf7.bdwm.be/show-group-based-on-number-of-selected-checkboxes/ (note, you need the PRO plugin for this method to work)