Hi Amandeep,
Welcome to Microsoft Community.
I'm Hahn and I'm here to help you with your concern.
I'm sorry to hear that you are having trouble with switching between edge tabs using ALT + TAB, there are a few things you can try to resolve the issue:
Would you first tell me what your current Microsoft Edge version is?
- One solution is reset the browser, but note that resetting the browser will delete data such as browser personalization settings, extensions, bookmarks, and saved passwords. If you wish to try resetting Microsoft Edge browser to fix the Alt+Tab switching tabs issue, you can follow the steps below: Go to Settings > Reset Settings.
- Another solution is to create a new edge profile and see if the issue persists. This can help you rule out any problems with your current profile settings or extensions.
- A third solution is to create a new local account on your Windows and see if the issue occurs on that account. This can help you rule out any problems with your Windows settings or permissions. Create a local user or administrator account in Windows - Microsoft Support
If you've tried these steps and still can't use Alt + Tab to switch between Edge tabs, you may want to report the issue to the Edge development team, as it could be a bug that needs their attention. Click on the three-dot icon in the upper right corner of your browser and select "Help & Feedback" - "Send Feedback", which will open a window for you to enter your feedback and a screenshot.
I hope this helps. If there is anything not clear, please do not hesitate to let me know.
Your Sincerely
Hahn - MSFT | Microsoft Community Support Specialist