How display file path at bottom in "All My Files" on Sierra 10.12.3?
The one you reference in the screenshot can be enabled in either of the following two ways:

Using the Mouse


Ensure the Finder is active
Go to the View menu
Select the Show Path Bar option


Using the keyboard

You can also use the following keyboard shortcut:

optioncommandP

You may not be aware, but you can also customise the Finder Toolbar to include a Path button. To do this:


Ensure the Finder is active
Go to the View menu
Select the Customise Toolbar... option
Drag the Path icon to your toolbar
Click on Done


Note: The icon looks like: