half transparent material when import xps file I imported xps files and some of them have backface culling like issue. 

https://imgur.com/a/kUhF8Pk

even resetting to default material didn't work


I also tried 
1. turn on and off backface culling option
2. flip normals
3. recalculate normals
4. change render engine

Thank you.
Did you check your alpha settings in the Material Settings? Depending on what kind of Alpha behaviour your Eevee Shader should have you need to change it. 
To reset it to default it needs to be at "Opaque" then it will draw as a solid.