Adobe InDesign - Manual (Page 256)

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Character direction
Story direction
When you're working with Arabic and Hebrew languages, the story generally flows from the right to the left. The first column must be on right side
of the frame, and subsequent columns are added to the left. If your layout contains mixed content, then different stories need a different direction.
From the Story panel (Window > Type & Tables > Story), click a story direction.
Story direction
Automatic Kashida insertion
In Arabic, text is justified by adding Kashidas. Kashidas are added to arabic characters to lengthen them. Whitespace is not modified. Use
automatic Kashida insertion to justify paragraphs of arabic text.
Select the paragraph and from the Paragraph panel (Window > Type & Tables > Paragraph), choose a setting from the Insert Kashida drop-down
list. The options available are: None, Short, Medium, Long, or Stylistic. Kashidas are only inserted if the paragraph is justified. This setting is not
applicable for paragraphs that have alignment settings.
To apply Kashidas to a group of characters, select the characters and choose Kashidas from the Character panel menu.
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