Click on the down arrow at the top right of the page, then click on User Profile.
In the left-hand side menu, select Security. In the Multi-factor Authentication section of the page, click Update.
Select the frequency you want to set your MFA to prompt on login from the drop-down menu. The options available are: Every Login, Daily, Weekly, or Never (only for new devices). Once the frequency is selected, click Save.
You will see that the frequency has been updated and will show the currently set MFA prompt frequency.