Set the QGIS display to show decimal degrees?

Using QGIS 2.6.1 Brighton. I am trying to set the CRS for the project to display Decimal Degrees, where it is defaulting to Feet. I can change it in the Properties Dialog, but it does not change it, it is just staying on Feet. How do I change it?

Edit: this layer was imported from a shapefile where it was internally set to Feet. I was able to get the vendor to supply one with Decimal Degrees so my problem is gone. Still would love to know if there was a way to do it myself from within QGIS.

Answer

Within the Project Properties > General dialogue box, you should have an option to set the Canvas Units:

However: it seems for using Decimal Degrees as your display units, your map must be projected 'on the fly' to WGS 84 / 4326:

Keeping your map in your original coordinates seems to limit the use of decimal degrees, while you can still use DMS, Degrees Minutes, etc.