What does the red square on Dynamic Island indicate?

"red square on the dynamic island: does anyone know what the small square on the Dynamic Island mean? and how do I turn it off ? No apps open - still stays on"

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Thank you for the screenshot.

About Red Square on the Dynamic Island:

A. Screen Recording is Enabled:

Start with a Force Restart

B. Closure of All Apps:

An app is accessing your screen recording. So, close all apps. Hold you finger down as you swipe up. Then, close all of these open apps, by swiping up quickly for all apps.

C. Find Out More Here: Take a screen recording on iPhone - Apple Support

As it Reads: "Note: Screen recordings may include audio as well as video, although some apps might not allow you to record one or the other. You can’t record your screen and use screen mirroring at the same time."

It means that the microphone is on.