Hello!
How can i turn of xray(may be alpha or something) of muscle geometry? It is visible through all objects and when a lot of muscles, it is hard to understand what is going on.

You can either a) turn it off globally via the Display Options, Scene tab, or b) go to the muscle Object tile in the network editor, RMB > Flags > XRay.

Edit: Or c) turn off Muscle display in the Visibility menu (Right toolbar, sunglasses icon).

Thank you, twod!
Option a) helps.