I asked a similar question. You can check out the thread here: Selecting one option or another on a single screen
Basically, you’ll want to create a true/false for each toggle type then a condition that will update the one selected to TRUE and the other one to FALSE. And vice versa.
Remember, the toggle button auto updates the database as soon as it’s selected on page load. So, if you want an option already selected, then add an action on the entire page so when a user visits the page it updates one of the true/false properties to TRUE and since it will be marked TRUE the other will automatically be marked FALSE because of your condition.