A script window can contain multiple tabs. Each tab is a separate document.

Thus, a document can appear either in a window by itself or as a tab in a window along with other documents. Use whichever arrangement you find convenient for navigation and organization as you work; mix and match!

Whether a document appears in a separate window or as a tab in a script window along with other documents depends on how you open it.

If you prefer your script windows always to have tabs, even when there’s only one, choose View > Show Tab Bar at a time when there’s only one tab.

To navigate between tabs within a window, choose Window > Select Next Tab or Window > Select Previous Tab. The keyboard shortcuts for these commands will come in very handy.

To rearrange tabs within a window, drag a tab sideways.

To turn a tab into a separate window, drag the tab right out of its current window.

(Alternatively, you can open a tab as a separate window without destroying the tab: choose File > Open in New Window. The result is a document that’s being edited by multiple windows simultaneously.)

To move a document into a tab in a given window, close the document, bring the window to the front, and open the document as a tab.

To close a tab, choose File > Close, or click the symbol (“x” or dot in a circle) at the left of the tab.

To close all but one tab, hold Option and click the symbol (“x” or dot in a circle) at the left of the tab.

To close a window and all its tabs, choose File > Close Window.