Using New Outlook on Windows for personal email, calendar, and contact management
Don't worry about that; I'll help you.
Let's take it step by step:
About the blue icon (Do Not Disturb icon)
About Settings (System)
If your system looks different from the images, you are likely using a different version (Windows 10 or earlier).
In that case, you can send screenshots and photos, and I can assist you using them.