I recently purchased a copy of Lightroom 6. On startup, I would always see a message about Lightroom Mobile. I have no interest in Lightroom Mobile at his time. Some time passed and now when I start Lightroom, at the top left, there is a message that says "Lightroom Mobile Trial expired". This fine because I don't need to use it, but I don't want to continue seeing the message.
I can get rid of this message by going to Preferences>Lightroom Mobile>Delete All Data. But it returns whenever I reopen Lightroom. How can I get rid of it permanently and not have any other interaction with Lightroom Mobile until I choose to do so?
Click on the identity plate in the upper left-hand corner of the Lightroom workspace. You'll see an option to pause Lightroom Mobile. Once you have done that, the message should go away. Actually, just click on the prompt, "Sync with Lightroom Mobile".