FaceTime video are square size

Thanks for letting us know, sheinatwain,

Do you experience the same behavior after you restart your iPhone?

Also, if you go to Settings > FaceTime, do you have Speaking enabled under Automatic Prominence? If so, you can disable it then test your FaceTime call again.

If you're still experiencing the same behavior after restarting and adjusting your settings, we'd suggest that you contact Apple directly to investigate this further with you. You can reach them here: Contact Apple Support

Take care!

Understood sheinatwain,

Is your iPhone up to date? Go to Settings > General > Software Update and see if one is available.

Cheers!

Hi sheinatwain,

Thank you for using the Apple Support Communities! We would recommend the following article to check the settings including the section "Share your screen":

Use FaceTime with your iPhone, iPad, or iPod touch

Hope this helps!

Have a great day.