remain unchanged. Here, use of the tool collapses and removes coincidental vertices. In other words vertices that are close to others, or occupy the same physical location or position (coordinates) are merged together and redundant or duplicate vertices removed. In this way a mesh is ‘cleaned...
layout.prop(self, 'merge_vertices') layout.prop(self, 'import_shading') layout.prop(self, 'guess_original_bind_pose') layout.prop(self, 'bone_heuristic') layout.prop(self, 'export_import_convert_lighting_mode') layout.prop(self, 'import_webp_texture') ...
Since they're coplanar circle/box select vertices inside and remove them. In your case many edges share a single vertex so removing one vertex you remove several edges at once. It gives you better control as you choose what to remove. And the size of your file suggests decimate would n...