Parts transparent

This may be a stupid question since I am new to this software.
I imported a cylindrical part and have been working on it for a few days.
Each time, I get a prompt asking for automatic viewing or something similar, and one time I clicked on the option to never show this prompt again.

What end up happening is, I can no longer see it. The model is still there, but it is completely transparent. It will highlight the model in blue when I click on it in the model tree or box it using the cursor, but if I click off, it became tranparent.

I had checked the graphics settings of the object, as shown in the picture. Please let me know what I can do to fix this.

I had also reset all preferences., but the problem persists.