You can easily toggle between your external bank account and your Dave spending account at any time.
Just head over to the Dave Home screen under the Home tab and select your bank in the top left-hand corner to toggle between the balances of your connected bank accounts.
Switching your main bank account is important when you are requesting an advance.
If you have both a spending account and an external checking account linked, make sure to toggle to the account you want to send the advance to before requesting the advance.