Can't fix this stupid thighs

Because of how you cropped the picture, i'm guessing we are seeing here a butt and the behind of the thighs, riggt ?

Well....i don't know what base model you are using. (V4/G1/G2/G3/G8)
But i would suggest at first to maybe look toward morph pack that deal with glute, hips and thighs.

For example
Like Glute Control for Genesis 8 Female(s)
https://www.daz3d.com/glute-control-for-genesis-8-female-s

or Bend Control for Genesis 8 Female(s)
https://www.daz3d.com/bend-control-for-genesis-8-female-s-46267

Of course, you'll have to look for morph that fit your base model generation.

Again, it's hard to see because of the size of the picture, but from what i see, creak like that are usualy toned down with some smooting morph from those pack.

Lacking all context besides this image, the first place I'd look is at your parameters around the thighs, use the currently used setting and look for dials that are set to extremes. Beyond that, more details would be required.