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Add an RTL language package (Hebrew or Arabic or Farsi...) to Moodle (Home / ► Site administration / ► Language / ► Language packs)
Switch to the RTL language you have installed by navigating to Moodle's Front-page and choosing it from the Language menu (or add "&lang=he" to the end of the URL you are currently using. If inside a course, set the RTL language from the course's setting)
Navigate to any course
Turn "editing" mode on
Click the "+ Add resource or activity" link (on the bottom of each Topic)
Resize the browser and make it smaller so the dialog that pops up is not able to show all the activities and resources one page
Make sure you see a scrollbar appear, next to the Activities and Resources list (the the left)