Microsoft is making their services less secure:

"

https://support.microsoft.com/en-au/account-billing/avoid-staying-signed-in-on-a-public-computer-d3f1448b-64b9-4b35-89d0-ce56715c6756

The web browser sign-in experience is changing when you sign in to any product or service using your Microsoft account. Starting in February 2025, you will stay signed in automatically unless you sign out or use private browsing.

If you sign in on your own computer, your browser will remember your sign-in information, but if you sign in on a computer, phone or tablet that doesn't belong to you, or is accessed by other people, you should follow the steps below to use a private browsing window instead.

Private browsing ensures that others won't be able to:

Access your Microsoft account, OneDrive or Outlook.com mailbox.

See your search and browsing history.

To sign out from your Microsoft account in a web browser, select your profile picture in the top right corner of the page and select Sign out. Alternatively, you can sign out manually below.