How to find all items that have enabled two-factor authentication?

@IamJerry

Yes, this should be in the Search bar as you've shown. Check one of your items that has two-factor authentication turned on and see what the one-time password field is called. In this example, this test Air Canada item has it labelled as one-time password, which is the default for English:

If the field in your item is labelled differently, try searching for that instead and let me know what you find.