In this third-party app, you can collect all the open windows into a tabbed window by selecting Window > Merge All Windows.
Once the windows are merged, the tabbed window activates the navigation menu items and keyboard shortcuts. You can also activate a tab and select Move Tab to New Window to take it out of the tabbed window and into its own; you can also do this by clicking and dragging a tab out of the window.
In a tabbed window, the Window menu displays the options available to you.
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