Pause the sync in LR Classic. Click the identity plat and select Pause button to the right of Sync with LR CC.
On your phone tell it not to auto sync with LR CC.
It already says sync is off. There are no options on my phone (that I know of) to tell it to sync or not to sync with LR CC. I do not have lightroom mobile on my phone?
It's in the LR CC app on your phone. Something like Auto Add.
Are you using LR CC to take pictures?
I don't have a LR app on my phone. All photos taken on my phone, screenshots etc are being imported into my LR catalogue on my iMac.
No app on your phone, except LR CC, will sync with LR Classic CC or the LR CC Website.
So although you don't think you have LR CC on your phone in actuality you do. Otherwise no images take on your phone would sync down to LR Classic and to LR on the Web.
Also what do you mean by a Gallery? There are no Galleries in LR. There are collections.
Sorry, I meant folders.
I have just double checked and I definitely do not have a LR app on my phone. I even went to the app store and the app for Lightroom CC still says 'get' not open as it would if the app was already on my phone. I do plug my phone in to my computer to charge it. Maybe it's somehow syncing when I do that, even though auto sync is turned off.