Mailsender: poor formatting of Options page on thin screens / mobiles / tablets

On Email Sender options page there are two formatting bugs:

• if you make the browser thin but not thin enough for the LHS ‘page menu’ to auto hide then (in Firefox, Chrome and Safari) then "Add to Email Archive, visible to all site participants"(on Options page)  jumps down a line leaving its checkbox on a line of its own.

• Also, "Display empty recipient groups:" is left justified and all other labels are right justified.

Open

If you make the browser as thin as possible then "Display empty recipient groups:" is left justified and all other labels are left justified but the other problem doesn't appear.