I am usually able to adjust any image e.g. for perspective by moving the placeholders in crop mode. In this mode a single arrow shows when I drag the individual placeholder before cropping.
For some reason my computer is now only allowing me to adjust an entire vertical or horizontal place. Interestingly there is a double headed arrow that shows as opposed to the single arrow as stated above.
I recently reset Photoshops preferences to 'default' which may help explain things to the experts.
Specifically, I am trying (see attached image) to adjust the crop to allow for the converging lines of the pillars so the pillars are now straight.