I can’t speak for @Henry.Woodbury, but I have been occasionally puzzled by how to use the Targets feature. The interface was a little cryptic to me. On a PC, I see this:
I have to scroll down within that mini pop-up window to see the Budget field and the Save/Cancel buttons. Depending on the width of my browser window, sometimes the vertical scroll bar isn’t visible. On mobile, it’s somewhat less apparent that important stuff is hidden down below. Maybe these are just quirks that result from my particular PC/Browser/etc.