==Requirements
[] Revert any changes for a merged pop up for page previews and restore page previews settings pop up.
[x] Logged-in users: Clicking the cogwheel should send users to the appearance preference tab where Reference Previews can be disabled, matching the behavior of Page Previews. The preferences will be separate (TBD)
[] Anonymous and non logged-in users: Clicking should open a new Reference Previews settings pop-up with the wording below. Disabling Reference Previews should add a second screen to the pop up a link to the bottom for the page for the user to re-enable it, implemented in {T277640}
[] Hide cog wheel on RefPreviews popups on beta feature wikis and ensure that there is no additional white space when cogwheel is not shown, as fixed in {T276200}
[] TBD: Define interaction with so-called "advanced" setting.
==Mock
Pop up for Reference Previews only:
{F34165604}