FIxed window size

That is a workable solution - people have used some version of it and it should talk to the LMS.You can also make that same action automatic by creating a new one at the page level on the first page. (do NOT drag the current button action to the page level) The new action is:On: ShowAction: GoToTarget: Chapter/Section/Pageetc. in a new window as you have now. Then the user is not even aware of the window.