The keyboard shortcuts
Justify Last Left is Command + Shift + J (Mac) | Control + Shift + J (Win) will justify the paragraph except the last line.
Justify All is Command + Shift + F (Mac) | Control + Shift + F (Win) will justify the paragraph AND justify the last line
https://community.adobe.com/t5/photoshop-elements-discussions/is-there-a-way-to-justify-text-in-photoshop-elements/td-p/4118979
If you had a paragraph panel in elements (like photoshop) then these are the buttons that those shortcuts correspond to:
(unfortunately the other two justify options don't have any default keyboard shortcuts in elements nor photoshop, as far as i know)
