Ctrl+shift+mouse wheel
Up to go left, down to go right.
Keyboard shortcuts in Excel - Microsoft Support
You may also try macro. You need two macros. One for left and one for right.
Note: Shortcut key must use Ctrl+letter or Ctrl+Shift+letter , I use ctrl+J and ctrl+K in your scenario.
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Sub HorizontalScrollRight()
ActiveWindow.SmallScroll ToRight:=1
End Sub
Sub HorizontalScrollLeft()
ActiveWindow.SmallScroll ToLeft:=1
End Sub
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