As you browse through your Microsoft account settings, you may find some surprises. Here are some tips to help you secure and customize your account:
To control what apps have access to your data, navigate to “Privacy” > “App access.” Click the “Details” button next to each app to see what information is being shared.
Disable personalized ads and third-party data sharing by clicking “Privacy” > “Personalized ad settings.” Disable both options under this section.
Turn off promotional emails from Microsoft or manage your subscription settings in the “Settings” > “Privacy” > “Promotional communications” section. Be cautious of recurring charges, especially for services like Xbox Game Pass and Microsoft 365.
Enable two-step verification by clicking “Security” > “Manage how I sign in” > “Two-step verification.” Set a backup email address and phone number to ensure account security.
Consider replacing your account password with a passwordless account using the “Manage how I sign in” page. However, be aware of potential incompatibilities and limitations.
Clean up your activity history by clicking “Privacy” > “Empower your productivity,” then select “Browsing and search” and click “Clear all activities.” Remove devices you no longer own from the “Devices” list to keep your account organized.
Check your recent sign-in activity by clicking “Security” > “View my sign-in activity” and verify unfamiliar signs of account compromise.
Source: https://www.pcworld.com/article/2903382/10-crucial-microsoft-account-settings-you-need-to-change-now.html