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 at the lower-right of the Paragraph panel, choose an option from the Insert Kashidas pop-up menu: None, Short, Medium, Long, or Stylistic. Note: Kashidas are inserted only in paragraphs with fully justified margins.
To apply Kashidas to a group of characters, select the characters in the document, and then choose Type > Language Options > Kashidas. A font can provide alternative shapes for certain letters, typically for stylistic or calligraphy purposes. In rare cases, justification alternates are used to justify and align paragraphs containing these shapes.
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Justification alternates can be turned on at a character level, but only if a font supports this feature. At the bottom of the Character panel, select Justification Alternates. These Arabic fonts contain justification alternates: Adobe Arabic, Myriad Arabic, and Adobe Naskh. These Hebrew fonts contain justification alternates: Adobe Hebrew and Myriad Hebrew.
Photoshop: Enable Arabic text/writing in English version Vote. Although I use both Arabic and English languages but I can not use Photoshop with Arabic version, it's difficult for me to understand it. To work with Arabic text in an English version of Photoshop, you will need an existing Arabic text.