Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
1. which section? can you provide me the screenshoot?
2. From frontend you can disable the online status by each user, go to pref page->uncheck "Show online status"
3. Go to Jomsocial configuration->photos->settings->set "Image Output Quality" to "Very High"