I am trying to format the chapter headings in my Microsoft Word like this:

"Chapter 1: "

Word seems to already have an option for this (highlighted in grey) Word Chapter



However, when I select this option as is, the chapter heading is slightly indented to the left compared to the rest of the text:



I would like the chapter heading to be aligned to the left margin, like most of the paragraph is (except for the first line).

I can accomplish this if I change the tab level of the heading. However, if I do this, the chapter title text ("This Is Chapter One") remains to far to the left, with an unnecessary amount of space between the chapter number and the heading text:





I would like there to be only one space between the colon and the chapter title, but I cannot figure out how to accomplish this.

Any suggestions?