While using WhatsApp in Samsung M31, swap the camera from rear to front and again to rear to get the camera setting changed to the normal. If you do this again, you'll get again wide angle camera settings.
Swap the camera (front and then rear) while clicking photos in WhatsApp and you'll get a normal camera setting. When you again swap you'll get wide angle camera settings.
Got the solution to this...
While capturing a photo from whatsapp just swap camera one time (selfie and then rear). You will get a normal camera setting and if you again swap camera you'll get wide angle