[whpalmer4]

Actually, the iOS apps do not have any user interface to set/clear/inspect this option, although they do heed it if you've set it with the Mac app. The Mac also has an option to set this property by default for any newly created group or project.

Use the Send Feedback or Contact Omni features on the settings page to submit a feature request for this. Apparently not enough people have done so, and no one has felt sufficiently guilty about leaving this out.