How to change the text of a designated column on an existing template.

Hello! I am so happy this forum exists btw. I was able to add fields and have linked changes in depth of borings between the PROJECT and POINT tabs to an existing template BUT the column reads 'Depth (feet)' and I need it to be inches. I've added inches in all fo the relevant properties tabs but I I am unable to change the column heading so that it reads 'Depth inches' instead of 'Depth (feet)'. (see below). How do I change the title of that column?