I had checked before those options under skin rule and come to check again as you mentioned, but there is no option regarding the modal position on the screen, which is always positioned in the center. I would like to make it appear on the right side instead of centered as it is now.
Yes your understanding is completely correct. By default when it is a modal dialog component its behavior is show in the centre. This ability is based on the browser and not respective to Applications however we have a scope of overriding with Cascading Style Sheets(CSS).