Hello,
1) Follow the documentaction and finish translation of theme and XStore core plugin (Loco translate > Themes > Xstore, Loco Translate > Plugins > XStore core).
2) Go to Theme Options > Header builder > edit Search, Wishlist, My account elements and write texts in Arabic there.
3) Once you finish with the header editing then create multiple header for the EN version of the site https://youtu.be/BpeXfzNwkOc and translate strings there.
Regards
Regards