How to modify all blender materials at once

Hello! I want my character in Blender to look completely normal for rendering, however regarding Blenders new changes I have to change the settings of each material so that it’s opeque and has not set png source

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As you can see there are many materials for my character and I don’t want to go through the effort of changing all of them indivutually, I want to know how I can change all of them at once or simply a quick method.
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2 Likes

copy and rename? Idk I have never tried doing it before, pretty sure you cant

In object mode, select all objects ( B , then rectangular select), join the meshes ctrl-j , change the color, tab into edit mode, P to seperate the objects again. This is quite possible since the meshes of all my objects do not touch.

that’s not the same thing they want to do