I am logged in to the Steam app on my phone, where I have Steam Guard active. However, I noticed that the app does not update the number of my friends. It shows more friends than I really have. I would like to log out, maybe this will update the numbers, but I have a question.

If I log out, when I log in again, do I only need to enter my login and password, or will the Steam Guard code be required? If the code is required, how can I enter it if I am logged out of the app?

Please help me and explain how it works, because I do not want to risk it without the answer.