Does this issue occur when all extensions are disabled?: Yes

• VS Code Version:Version: 1.64.0 (user setup)
  Commit: 5554b12
  Date: 2022-02-03T04:22:20.678Z
  Electron: 13.5.2
  Chromium: 91.0.4472.164
  Node.js: 14.16.0
  V8: 9.1.269.39-electron.0
  OS: Windows_NT x64 10.0.22000
  or
  Version: 1.65.0-insider (user setup)
  Commit: 97c1e76
  Date: 2022-02-07T08:55:59.620Z
  Electron: 13.5.2
  Chromium: 91.0.4472.164
  Node.js: 14.16.0
  V8: 9.1.269.39-electron.0
  OS: Windows_NT x64 10.0.22000

Steps to Reproduce: View the Output view, expand the dropdown after it's filled with enough options (and/or reduce the height of the Output UI area) and try to drag/scroll the scrollbar on the right. See the screenshot:

Bug: The scrollbar is not clickable or draggable. The workaround is to use the keyboard to scroll through the list.