Why is my Sit-stand rating Improve when I am at a fixed height desk?

Your Wellbeing report maybe showing Improve as your sit-stand rating, but your app is set to Fixed Height desk.

The purpose of sit-stand is to record your movements during the day at your desk.  If fixed height is set, the application will send the total amount of computer use as a set value and therefore the recommendation will be generated to advise changing your position more frequently.

If you are always using a Fixed height workstation you may want to disable the Sit-stand feature completely.  This will remove the option on your app and remove the sit-stand data being communicated to your reporting site.  

To disable the sit-stand feature see the following article - Editing your Wellbeing feature sets

The two features to turn off are:

1. Sit-stand reminders
2. Sit-stand wellbeing