If "set" means in design view, that may not be good enough as an opening form window can inherit certain attributes from other open forms, such as restored size that occurs after a minimize or maximize. Or if there is an open form that was maximized, a form opening afterwards can become maximized. You didn't say if the dialog forms were popups or not. Popups aren't usually affected by a previously maximized form.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.