Add a close icon button to the SMART mirror floater that remains visible on screen once SMART mirror is activated. This floater can be disabled from the Settings, but this is not obvious to teachers/faculty who are used to being able to close floating (undocked) dialog boxes either by swiping off screen, swiping to an onscreen ⓧ, or clicking on a close icon on the floating dialog box. The floater is persistent even after the SMART mirror session is over unless disabled in the Settings.