You can also fetch the material network and alternate whatever you want inside it. Note that this workflow works only for non-V-Ray materials such as MaterialX materials.
1. Create an Edit Material Network LOP (right-click in /stage > Materials > Edit Material Network) and chain it to the rest of the nodes.
2. Fill the Material Path to the material you want to edit, and then click Load to fetch the material VOPs inside the Edit Material Network LOP.
3. Dive inside the edit Material Network LOP. Select the parameters you want to alter and set the new values for them.
