Location of fuse for the ambient lights

This vehicle should still be in bumper to bumper warranty unless the mileage is over the warranty coverage limit. Take it to your local Chevrolet Dealer and let them fight with it. If you try fixing it you run the risk of voiding the remaining warranty. Same is true if you have a "mechanic shop" look at it. Jim

The options on that car via the infotainment center and the dash cluster are like the Starship Enterprise. Drill down menus to find lighting/interior and you'll probably find an option to turn ambient lighting on/off. Read your owners manual, I know, nobody does, too find instruction. Or just ask at the dealership. Instruction on car use and settings is part of what you paid them for.