Basically, when I'm doing certain tasks, I like to be in full-screen mode with the navigation and other tabs open. When I'm doing simple edits or using the browser debugger, then I like just the editor pane open in a "slim boy" style, taking up less than 50% of screen real-estate. At the moment I have to hit shortcuts, use the mouse to close tabs and resize the window. Just coming out of full-screen leaves the tabs horribly out of proportion.
I'm still a relative noob to IntelliJ IDEA, so maybe there's a better solution that already exists. If not, is it possible to make a request?