Steps to reproduce the issue: Open a PDF file in single-page continuous layout. Connect an external mouse. Compare scrolling the PDF with an external mouse and with the built-in trackpad.

Environment: Acrobat Pro DC 2021.001.20145 on macOS 11.2.3 in MacBook Air (Retina, 13-inch, 2020). External mouse: Logitech M720 Triathlon. Smooth scrolling is enabled.

Expected result: Scrolling with the scroll wheel on an external mouse should scroll the PDF as smoothly as scrolling with the built-in trackpad.

Observed result: Scrolling with the scroll wheel on an external mouse scrolls the PDF too quickly compared to smoother scrolling using the built-in trackpad.