Short version:
Improved Person columns in Microsoft Lists: MS are improving the behaviour of Person columns in lists by making the suggestions that appear when you type more relevant.
Details:
Microsoft are improving the behaviour of Person columns in lists by making the suggestions that appear when you type more relevant. When you type in the people picker, the autofill suggestions will come from Microsoft Graph (which knows who you interact and and work with). This makes it the people picker more personalised and relevant based on who you work with most often:
Availability:
This feature rollout will begin mid-March and should be complete by late April 2021.
