Hi Mohamed,
Thank you for sharing your question. I understand how annoying this language switching thing is when you need it to work fast. Based on what Microsoft says and what others are seeing, I am here to help.
The reason Right Alt + Shift only goes one way (English to Arabic) is a bug in recent Windows updates (like KB5070311 for Windows 11). It's not your fault. Left Alt + Shift still works because the system likes it better. Right Alt (which is like AltGr) can mess with language switching, especially after updates.
Please follow these steps.
Double-Check Your Shortcut Settings
Head to Settings > Time & Language > Typing > Advanced keyboard settings.
Click Input language hotkeys → Change Key Sequence.
Make sure both Left and Right Alt + Shift are turned on for switching languages. Turn them back on if they aren't.
Use a Different Shortcut for Now
Try using Win + Spacebar to switch languages. People say it works even when Alt + Shift doesn't.
Look for Bad Updates
If this started after you updated Windows, get rid of the update that's causing trouble:
Go to Settings > Windows Update > Update history > Uninstall updates.
I hope this helps.
Best Regards,
Noel