text: Title: Scoring Sheet Viewer: slider not working
  Body: **What's wrong?**
  Based on the documentation I assume the slider at the bottom of the widget should be able to move? I cannot move it nor do I get a tooltip.
  
  
  **How can we reproduce the problem?** 
  File (heart-disease) - Scoring Sheet - Scoring Sheet Viewer
  
  
  **What's your environment?**
  - Operating system: OSX
  - Orange version: 3.38.1
  - How you installed Orange: dmg
  