Have you noticed how when you have text that you want to number as a heading with a fullstop next to it, that the number 1 immediately indents and make the text smaller when you put a space between the number and the text? Yet you can put space on any other number and it’s fine. It’s annoying right?
To get around that, type the number and the fullstop, then hold down the SHIFT key then click the SPACE BAR, then type the rest of the text. Problem solved.
Otherwise just use the format 1) or just a plain 1, and it won’t indent in the first place.