How do I fix my SAMSUNG A80 sliding camera?

@lindamgulwa, Reading your question literally, I would have to say that the cameras on your A80 all come as a single assembly and are generally not considered to be repairable. However, they are definitely replaceable, which should solve your problem. iFixit doesn't have a guide to that repair, but the Spanish site Nadie Me Llama Gallina has just what you need.

Manuales / Samsung Galaxy A80 / Cameras - Nadie Me Llama Gallina

The site is in Spanish, but used with the Chrome browser's translation feature, it is quite usable and well written. The part itself is readily available; I saw it for sale on Amazon, eBay and AliExpress, and several other sites as well. Here are a couple of examples.

Amazon.com: Compatible with Samsung Galaxy A80 SM-A805F Replacement Rear Camera : Cell Phones & Accessories

For Samsung Galaxy A80 A805 Main Back Big Rear Camera Module Flex Cable - AliExpress 509

No matter what problem you're having with the camera, replacing the module should take care of it.

Good luck and let us know how it all turns out for you.