As I understand it, If the loaded firearm is accessible by a non-CHL person in the vehicle, it’s an F-4 felony offense in Ohio.
If everyone in the vehicle does not have a CHL, make sure you have the firearm secured in a holster on your person under your control, or at least placed somewhere inaccessible to the non-CHL person (e.g. you are driving and you have the firearm in the driver’s door storage compartment). Not a perfect solution, but better than the glove box or center console.
Do not leave a loaded firearm in an unlocked glove box or in the center console if the non-CHL person can access those areas easily. If you lock it in the glovebox make sure the non-CHL person doesn’t have a key to open it.
I have my CHL, as does my wife and adult son, so for us it’s not an issue unless there is someone else in the vehicle.