Unfortunately this is an absolute necessity if you’re offering drive through. The whole setup only works if you keep the line moving as fast as possible. This further incentivises people to not go in and use the drive through. A vicious cycle is born. If the folks in cars need to wait you’re essentially just doing a very inefficient version of curbside pickup.

The whole problem starts with putting a single oversized location somewhere out in bumfuck nowhere where everyone needs to drive to instead of multiple smaller locations in places where people already are because they live or work there.