Can't see lines

Hello all,

Why I cant see other lines in second picture when I turn off object behind I cant see. I needed because I want to make ppt architecture presentation like this one:

Hard to tell without seeing the SketchUp file. Possibly due to having hidden or softened edges. Maybe edges turned off in the style. Share the .skp file so we can see exactly what you set up and give you an exact answer to fix it.

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The file is too big to upload it here.

Tags 1,2 and 3

Incorrect tag usage is the main issue. You have edges with tags. ALL edges and faces should be created and remain untagged. Only groups and components should be given tags. The result of fixing the incorrect tag usage:
Screenshot - 9_20_2023 , 9_08_43 AM

Also your model is a very long way from the origin. This can create issues with the graphics.

There are reversed faces that ought to be corrected. You should have no visible blue back faces in your model. Applying materials to them doesn’t fix that. They need to be reversed.

It would be a good idea to purge unused stuff from the model from time to time.
Screenshot - 9_20_2023 , 9_12_40 AM
That reduced the file size by about 72%.

I didn’t move the model close to the origin but you should do that. The face style is set to Monochrome so that you can see and fix the exposed back faces. The textures are still present.
SRAFURA NOVA purged.skp (12.9 MB)

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I see. Thank you very much.

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