How do I disconnect a Bluetooth device without unpairing on the Mate 10 Lite?

I am using the Huawei Mate 10 Lite. I have a problem: I would like to disconnect from one Bluetooth device but NOT disconnect from all Bluetooth devices and NOT unpair the device (i.e., still remember it in my list). Is this possible on this phone? 

Needless to say, it is extremely annoying to have my phone hijack all Bluetooth devices in the house whenever I need to use one, and it is also extremely annoying to have to constantly unpair and re-pair Bluetooth devices whenever I want to use them. Disconnecting and remembering a Bluetooth device ought to be a standard feature. Isn't it?

Thanks in advance! 

Sorry I'm not sure but I think I'm not understanding this correctly. But why not just turn off your phone's Bluetooth when not in use?

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