Mark the option/button in the following image of the view tab to open the current document to a
new window containing the view of the current document.
Explanation:
The New Window feature is used to open a new window containing the view of the current
document. Take the following steps to use the New Window feature:
1.Open the presentation on which you want to use the new window feature.
2.Click on the View tab. Click the New Window button.