OK, that features does simply not work.
I have two PCs one of them is a Surface Laptop Go with Win11 the other one a PC with Win10 and both with Office 14527.20276.
On the PC I use a Microsoft Precision Mouse. Thus, both PCs should meet the system requirements.
So the published Known Issues says:
Depending on the mouse or touchpad you’re using, you may not be able to scroll one pixel at a time. If you don’t have a “precision” mouse or touchpad, each movement will be based on the height of one line of text. If your Windows setting is to move one line for each click of the scroll wheel, it will move one line of text rather than one row of your worksheet.
But what do I need to change?
Under Mouse settings --> Additional mouse options --> "Wheel" tab, I have 2 options: How many lines to scroll or whole page.
??? That makes absolutly no sense.
If anyone can point me in the right direction, I would be very grateful.