Netflix works best on the bottom setting, to view or change this setting, start by logging into the ‘Sign In‘ on Netflix.ca, it’s in the upper right corner.

• In the upper right corner of the page select ‘Your Account’
• From this ‘My Account’ page, select “Playback Settings”
  
• Set to ‘Low’ and Save
  

That’s all the steps for a regular account, but if you have a kids profile on your Netflix, there’s a few more steps to fix the playback settings, we have a guide here:
Fix Netflix Playback Setting for a Kids Account