You can also convert units using the graphics editor. Continuing with the example above, let's convert back feet per second. Select the Value field and press the ... editor:
This will open up the editor for the quantity:
For the Units field, just select feet per second:
The velocity value will change from 62 miles per hour to 91 feet per second:
You can then press OK to accept or Cancel if you do not want to save the change.