Starting in December, we will archive content from the community that is 10 years and older. This FAQ provides more information.
Did you by any chance press ALT+X? (which is XRAY MODE) If so, Press ALT+X again to exit XRAY Mode. If this is by default, then you can
1. Open the LAYER EXPLORER
2. Then Right click on the LAYER that the object is NESTED in and then click PROPERTIES.
3. Then uncheck, SEE THROUGH.
If this happens only for the object, then you can either open the OBJECT'S PROPERTIES, and disable SEE THROUGH, or just select the Object and press ALT+X as mentioned earlier.