You can view more than a single tab at a time in Inform. You can pop-out as many tabs as you want to view.
To view more than one tab on the screen, double click a tab at the top of the Inform window.
The tab opens in a new window.
To view windows as a split screen, double click the title bar. Use the sizing bar to resize the view.
To return the windows to the tabbed view, click in the title bar and select Dock Windows.