App settings
The Settings page is reached from the button under the top-right menu:
Communication settings
The DataClassroom may send me promotional communications setting updates the choice you made when signing up on the app. These "promotional communications" include e.g. emails with new Classroom-Ready activities, new personal development (PD) opportunities, blog posts etc.
Google Classroom settings
If you don't use Google Classroom at all, you can select not to see the options in the app.
If you do, you can opt to have the Google Classroom option always be the default (for example, for creating a class).
Misc settings
Intro Tour. Here you can turn the Intro Tour on and off. That's the one you can see by clicking the icon in the header bar.
Dashboard intro options. Here you can enable the "getting started" panel that appears on the Dashboard for new users.
Google Sheet reload warnings. If you've turned off the warning that tells you that you are about to overwrite a dataset, you can turn it back on here.