My leg is not straight, how to straighten it, just like the one on the left in the second picture, how to correct it?

One calf is a little fat and the back muscles are big. You can exercise stovepipe. It may have some effect. But look at the first picture. If it's your leg. Then this problem should not exist.

It’s two o’clock. What I'm trying to say is. If the first picture is your leg. Your leg shape is normal. But you may not like it very much. Or feel extroverted because of psychological effects. Solution. If you are young. External correction can be used. Slowly adjust the leg shape for a long time. If you are older. Only internal correction surgery. It is recommended not to do it.

I hope I can help you. Take it.