The person icon in the top-left corner of your iPhone screen means the Personal Focus Mode is on. It is a part of iPhone's Focus settings that lets you specify which apps and contacts are allowed ...

The old icon had two people in it, which is almost a person icon at that point. Microsoft continues to roll out new icons to apps as it marches towards a unified set of icons across all platforms ...

If you don't want to see the person icon on your iPhone's status bar, it's easy to remove it: just turn off Personal Focus. You've got a few ways to do this.