Voucher Inquiry > Action Menu new modal window or not

At Accounts Payable - Review Accounts Payable Information - Voucher, when you search and get a list of vouchers, from the Action Menu, sometimes - for some users or the same user in different environments, we get the window, for example, for attachments, in a modal window that you can just X out of or press Cancel, if that option exists. However, in our PRD environment, it is NOT a modal window, it is the whole page and there is no option to get back to where you came from .

What controls how the window pops up from the action menu? Is it security or another setting?