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To close open documents, use one of the following actions that are available in the contextual menu of the current editor tab (or from the File menu):

Close (Ctrl + W (Command + W on OS X))
Closes the currently selected editor.
Close Other Files
If multiple files are opened, this action is available to close all opened editors in the current group/stack of tabs except for the one you are currently viewing. If this action is selected from the File menu, it closes all opened editors in all groups/stacks of tabs except for the current one.
Close Files to the Right
Available only from the contextual menu of the current editor tab and it closes all opened editors to the right of the currently selected editor.
Close All
If multiple files are opened, this action is available to close all opened editors in the current group/stack of tabs. If this action is selected from the File menu, it closes all opened editors in all groups/stacks of tabs.