How to select these two transparent faces to remove transparency?
Hold down Shift when you move your cursor onto it.
I was able to just rotate the part around a little so you are almost looking across the surface and ctrl pick them. Then select the the remove appearance option.
..and, you can rotate/position the transparent face(s) to be without any background geometry...
..or, select them in your Appearances under the chrom plate folder..
Also there is another method explain in this video.
How to Undo "Change Transparency" of a Face in Solidworks - YouTube
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