As my company does not allow firearms to be carried by employees, when I actually go into my office downtown, as opposed to working remotely, I Transfer my EDC to a secure location in my vehicle. I don't remove my holster as it is unnecessary.
That is just me though.
This could be an invitation for the less scrupulous to break into your car looking for the gun.
I thought about doing the same, but decided against it. If they don't allow weapons, they will surely not welcome an empty holster on an employee. Maybe since it's in the assembly area, and not a job where you have to interact with the public, they let it slide. They may ask about a weapon in the vehicle, which is protected and the employee doesn't have to answer. But they can still fire you for refusing to leave your holster in your car.
But, the chances of that happening are probably small. Most companies aren't super anti-gun, they have those policies for liability reasons. And they don't want a gun introduced into the workplace.