My mouse software (Microsoft IntelliPoint) doesn't include a smooth scrolling setting. It does have an accelerated scrolling setting, but turning that off made no difference in Start11. Most other apps on my PC, such as File Explorer, Notepad++, SumatraPDF, and Brave, don't scroll smoothly with my current "animations off" Windows setting.

I also checked for the "Smooth-scroll list boxes" setting in advanced system settings (sysdm.cpl), but I couldn't find it. Other animation options are disabled there though.

I found that setting, and it was off when I saw it.

I switched from the Windows 10 style (which had smooth scrolling) to the Windows 7 style. There is no more smooth scrolling in the All Programs list. Same with the Modern style.