A soft-close hinge may need two different adjustments: door alignment and the damping force or speed. First get the door aligned and free of rubbing; then adjust the soft-close feature if the model allows it. Using the damper to compensate for a crooked door does not fix the cause.
Align the door before adjusting the damper
Check that gaps are even and the door does not rub. Use the hinge alignment screws in small increments; the soft-close mechanism should work on a door that already moves freely.
Find the dedicated soft-close control
Some models use a multi-position lever and others a small screw, while many are not adjustable at all. Do not force an unidentified part; look for the hinge brand or model if the control is not obvious.
Adjust one hinge at a time and test several cycles
A door with two or three damped hinges can close too slowly if every damper is at maximum. Change one setting, open the door fully, and test several cycles before making another adjustment.
Replace a hinge that leaks, binds, or no longer damps
The internal damper is usually not a practical home repair. If a hinge binds, has excessive play, or no longer slows the door despite correct installation, a compatible replacement avoids stressing the door and cabinet screws.