You can write down the secret that is displayed as text and shared to an OTP app via the QR code when you setup or renew the 2FA. Most OTP apps allow a manual setup, that's where you enter the secret text code by typing it.

I advise not to make a screenshot of the QR code, nor save the shared secret text on any digital online device. Why? Pictures very often get synced to some cloud service(s) and you don't have any control who may access or analyse them there. Digital copies may get in wrong hands when an online device gets compromised or lost.