Where do you type your chapters? The ones from MS Word has almost the same formatting; I just do 'Select All' + 'Justify' on SH's text editor.
Ah, you mean you're combining text alignments, or just pure center? If it's the former, then we can't do anything about it.
Just take it one at a time, so that it'll be easier for you. That's how I do formats as well. If it's pure center alignment, just ctrl+A and hit center on the text editor.