MS has done a good job in some of its support documents in connection with formatting a number, e.g transform 12345 to 12,345.00 or $12,345 BUT offer no examples about how to actually do it on a form (detail or edit).
On this narrow issue, how is it done?
MS has great tutorials at:
https://powerapps.microsoft.com/en-us/tutorials/getting-started/
The trick is to go to the data card for the field (right panel), click advanced options, and UNLOCK. Then use the format formal in the format field (see the tutorials)(
Good job MS!