I had same problem, but after removing xserver-xorg-input-synaptics and other 
touchpad related drivers except xserver-xorg-input-libinput, and then rebooting 
it got solved.
See if that helps :)

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  App list not scrolling properly with touchpad

Status in GNOME Shell:
Status in gnome-shell package in Ubuntu:

Bug description:
  Steps to reproduce (20.04), shell 3.36.1:

  1. Open 'Show Applications' -> 'All'
  2. Attempt to scroll through the pages using a touchpad.

  Expected result:
  Scrolls through pages of applications one at a time.

  Actual result:
  Scrolls to second page of applications but will go no further.
  This happens whether two-finger or edge scrolling is used.

  Using an actual mouse with a scroll wheel works as expected. Using this in 
conjunction with the touchpad reveals horribly broken behaviour:
  - Clicking on the 'dot' for any of the pages will let the touchpad scroll at 
most one page in either direction, if the mouse is not moved
  - Moving the physical mouse lets the 'momentum' of the touchpad scrolling 
advance the list further as expected.

  Incidentally, the application menu doesn't honour the 'natural scrolling' 
setting for the touchpad in the mouse settings - I will file a separate bug 
report for this but it may be of interest for whoever looks at this.
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DisplayManager: gdm3
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2017-11-12 (903 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: gnome-shell 3.36.1-5ubuntu1
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
  RelatedPackageVersions: mutter-common 3.36.1-3ubuntu3
  Tags:  focal
  Uname: Linux 5.4.0-28-generic x86_64
  UpgradeStatus: Upgraded to focal on 2020-04-30 (3 days ago)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo wireshark
  _MarkForUpload: True

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