Add a number scale to a KPI card

When you have a numeric KPI, you can add and configure a Sparkline in the left panel.

The card designer for a KPI card. The Millions radio button under the Number scale heading has been selected, meaning that the number has been turned to a suitable decimal followed by the letter M.

Select a Number scale to format your KPI.
For example, if you have a value of 1,555,000, you can display it in one of these three formats:

Number Scale Display format
None 1,555,000
Thousands 1,555K
Millions 1.56M