Apply Opaque blend mode to all object at once I'm using Blender 2.8, I don't know how to apply blend mode opaque to all object, which I got from another source. 

Since it has so many object it's kinda tiring to apply it one by one. I've tried to select all objects in the viewport and/or in the outline (layer) and try to change them to opaque, but it doesn't work. Help :'(
I just learned how to do this when trying to figure out an answer for you. Paste and run the code in the text editor after selecting all the objects you want to change.

import bpy

context = bpy.context

for o in context.selected_objects:

    o.active_material.blend_method = 'OPAQUE'


I made a little add-on to make a helper panel to do this, not very fancy but if it is useful then that is great. https://github.com/artistCDMJ/opacity_helper/archive/master.zip