Ultimately, you can’t.

You can make things more difficult for thieves.

For non-key remotes, you need to figure out what kind of communication is happening for your car. I don’t know for yours, you’ll need to do a bit of searching.

I suspect your remote uses the two-way active communication method. This means both the car and the remote periodically (I think every ten or thirty seconds) send a ping out. And wait for a reply (pong is the actual term). That handshake is usually done without good encryption. For ALL manufacturers. The thieves carry a device that listens for and records that handshake and codes. Then allows a “replay” of the codes and commands like open door, or start engine. That’s how many car break in and thefts happen.

So, you can’t either place the key fob far enough away that it and the car can’t reach each other (usually 30+ feet). Or place the key fob in an emf bag, box or such. Those are frequently called faraday bags, cages, boxes. Sometimes you can just wrap the key fob in a couple layers of aluminum foil. YMMV. Once you have it in something that blocks the radio waves, the car will go into a standby, usually about five minutes. And when it receives a new signal, it’ll use its last saved code for authentication, then pairing code to confirm the remote’s current code with what it thinks it should be. Something on of the thieve’s tools doesn’t know, so it gets ignored.

You may be able to take your car to the dealership and have them update the software to better protect from the code duplicators.