“Your typesetter [and editor or proofreader] will remove double-spaces from your manuscript; that’s a simple fact. Though writers are encouraged to unlearn the double-space typing habit, they may be heartened to learn that intellectual arguments against the old style are mostly contrived. At worst, the wide space after a period is a victim of fashion.” Fun fact source.

To play your part in consistently laying out content, check your company’s style guide. And, if there’s no rule, use one space between sentences – it’s more common than two.