From the help file....
Make sure the scale ribbon bar is checked in the "customize the ribbon" selections....
Design Manager Streetscape Limited
Solid Edge ST10 [MP0] Classic [x2 seats]
From the attached image, it seems that the Command bar is missing.
It is hugely unlikely that it disappears just for the Scale command.
Can you try starting any other nearby command like Mirror or Rotate and see if the Command bar appears for those commands. In that case, see this thread where the issue was resolved.