To make the site appear in Arabic, and the site direction is from right to left, check as following:
- Make sure the communication site you use is created with the site default language you want to use, in your case is Arabic.
- Change the personal language and region settings via My office profile>Update profile>****How can I change language and regional settings? and then select the here link>In the In the Edit Details screen, select the ellipsis (…) and then Language and Region to see the site interface in their preferred language.
Please note the profile changes have been saved, however they may take some time to take effect. Don't worry if you don't see them right away.
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