Hello Ellen,
The “Enable jQuery Migrate Helper” plugin https://wordpress.org/plugins/enable-jquery-migrate-helper/ will still work for this issue, just make sure you use the legacy jQuery Legacy 1.12.4-wp version option to make the menu fully functional on mobile. http://prntscr.com/wf66kz (go to Tools / jQuery Migrate admin page to change this setting)
An update to the pro theme is in the works and will be released in the coming weeks.
