
Hi Boyang Lin,
Thanks for posting in our Q&A forum.
I tried to test in the latest version 116 and the horizontal scrolling (alt+ mouse scroll) is indeed not working.
Please try to use shift+ mouse scroll or left/right Arrow keys for horizontal scrolling in Edge 116 version.
For your requirement: bring back the (alt+ mouse scroll) feature and your suggestion: abolish the "Tab" shortcut or just develop a switch to temporarily cancel it, we would suggest you use Send feedback button (Alt+ Shift+ I) in Edge browser to provide feedback to Edge team.
Thanks for your understanding.
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Best Regards,
Maggie Bao