At any time, you can enable/disable this feature for each card on the admin web interface. You can make this adjustment by going to the 'Settings' tab and selecting the 'Cards' button in 'Expenses', which will list out all the cards which has this feature enabled/disabled.
To enable the feature, select the checkbox next to the individual card. Likewise, to disable the feature, simply unselect it. This might be useful should you decide to onboard your team members gradually, or if you have subscription virtual cards that you wish to process differently.