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I used to use Shift+scroll to scroll horizontally in the past. However, when I tried this on my MacBook running macOS Catalina, it didn't seem to work. I tried this with multiple external mouses—the result is only a horizontal scroll, irrespective of whether the shift key is held down. I tried this in Safari as well as some other apps.

I did some quick research, and it seems as shift-scrolling should scroll horizontally, as seen here, here, and here.

Could this possibly have been a removed feature in Catalina? If so, what are my options for getting it back?

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  • Did you mean "the result is only a vertical scroll"?
    – huyz
    Jan 5, 2022 at 20:41
  • That is indeed what I meant
    – Oion Akif
    Jan 7, 2022 at 13:33

1 Answer 1

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The issue was that I was using Mos to enable smooth scrolling on my Mac.

However, it removes the ability to scroll horizontally using the shift key by default. To reenable this behavior, go to Mos Settings > Advanced and then select "Shift" as the horizontal scrolling key. That should do it!

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    Thank you! I was so confused why it wasn't working anymore.
    – Alex K
    Oct 4, 2022 at 16:13
  • I have Mos and have the same issue, however this option does not appear in Settings for me in the latest version Jan 6, 2023 at 10:58
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    @LeaveTheCapital I have the latest version of MOS (I think) and the setting you need is Mos Settings > Advanced > Toggle Key. I have just set mine to shift and finally got horizontal scrolling on the mouse wheel.
    – Bryan
    Mar 22, 2023 at 14:14
  • @Bryan Thank you so much, it worked! Mar 23, 2023 at 10:10

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