How to not share devices in find my
When using family share, it shares the location of your devices as well as location. Location is fine. How can you turn off the location of all your devices? It lists all devices
MacBook Air 13″, macOS 10.15
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I don't know if this is what you need;
Find people and share your location with Find My - Apple Support
Change your sharing device
To change the device that you're sharing your location from, open Find My on the device from which you want to share. Select the Me tab, then choose Use this [device] as My Location.
You could, of course, disable location services on devices you do not wish to be found but that would disable it for everything.
You can see if this support article provides what you want About privacy and Location Services in iOS and iPadOS - Apple Support
I think the problem may be it is all or nothing. You can turn off features such as Find My, but then if you lose the phone you won't be able to find it.