Hi Adelalthobity,
Thank you for reaching out to Microsoft Community.
In adding Arabic and English keyboard layout to your Surface, please do these steps:
1: Open Windows Settings > Time & Language > Language
2: Under Preferred languages, click Add a preferred languagethen choose your preferred language (Arabic and English)
3: Click Next > Install
4: After installing both, you may adjust which language you want to set as first on the list
5: Click Choose an input method to always use as default
6: You may choose which language you want to use as input method
If this answer your question, we highly encourage you to inform our Community by clicking on Yes or marking my post as an answer. This will help other members who may have the same issue as you. Otherwise, don't hesitate to update us so we can further assist you.
Kind Regards,
Marrion Y.