We understand there may be reasons you’d want to reset totals, but to protect our donors, once donations have been received, the amount collected currently cannot be reset.
That said, if what you're really after is keeping visitors from seeing the amount raised, you can remove your Fundraising Goal — Support Pages without a goal show a simple "Donate" option instead of the amount raised toward a goal. You can remove or adjust your goal from your Organizer Dashboard: click Edit, open Donations, change Goal, and click Save changes. On a computer, you can also click "Edit" next to the "Support Page" heading on the front of your page. There's no need to turn off donations for this, since that stops new donations.
If you’d like to talk through your situation, we’re happy to help.