As long as you do not pair it to your Mac, iPhone, or iPad directly, you’re good. They can all discover whatever they want but will not connect. But once paired, they will typically try to automatically reconnect. Hence, my instructions to go “Forget This Device” on all your Apple devices in the Bluetooth settings. Aside from making sure Bluetooth is actually turned on, there is no reason to ever open your Bluetooth settings. All Zwift Bluetooth pairing is done directly from within Zwift.
For your MacBook there is a hidden Bluetooth menu. <Shift + Option> while clicking on the Bluetooth icon in the system tray. Now select “Remove all devices”. Then do it again and select “Reset Bluetooth module”
Once this is done, launch Zwift. In the pairing screen, make sure that the trainer is at a minimum paired as controllable if not also power and cadence. I don’t know if you have another power meter and/or external cadence sensor. But, “controllable” is a must if you want gradient resistance simulation.