You can identify yourself either by BankID or 2FA. It is the admin or owner that chooses with method they want the user to log in with. If you would like to change the method, the admin-user go to the "Admin-tab" in the lefthand-side panel. Press Admin and then go to "User admin". Click on the person that you want to change identification-method for. Click on the three dots under the "Action" headline. Click on "edit user". Choose the identification method that you want to change to. Worth mentioning is that you cannot go from BankID to 2FA, you can only "upgrade" the security-level, not downgrade.