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Each file that has been opened has a tab at the top of the editing pane and there are several ways to switch between tabs or move them.

Switching Editor Tabs

You can switch between editor tabs by using any of the following methods:
Mouse and Scroll Wheel
Of course, you can switch to a different editor tab by left-clicking the tab with your mouse, but when there are too many tabs opened to fit on the screen, you can hover over the tab stripe and use the scroll wheel on your mouse to scroll to the left or right (same as using the two arrows on the far-right of the tab stripe).
Buttons on the Far-Right of the Tab Stripe ()
You can use the arrow buttons () on the right side of the tab stripe to scroll to the left or right and the Show List button opens a pop-up window that displays all the opened file tabs and allows you to select and switch to a specific opened file.
Ctrl + Tab (Command + Tab on OS X) [NOTE: Ctrl + Page Down (Ctrl + Alt + Right Arrow on OS X) does the same]
Switches to the next opened tab in the order specified in the Order of switching between editor tabs option.
Ctrl + Shift + Tab (Command + Shift + Tab on OS X) [NOTE: Ctrl + Page Up (Ctrl + Alt + Left Arrow on OS X) does the same]
Switches to the previous opened tab in the order specified in the Order of switching between editor tabs option.
Window > Switch editor tab (Ctrl + F9 (Command + F9 on OS X))
This action opens a dialog box that allows you to switch to a particular editor tab by selecting it from a filterable list. This is especially helpful when you have a large amount of file tabs opened and you want to switch to a certain tab this is not shown on the screen. It includes a search filter field and several options to help you find specific opened file tabs.

Figure: Switch Editor Tab Dialog Box

The Switch Editor Tab dialog box contains the following options and features:
Search Filter
You can enter text in the filter field at the top of the dialog box to filter the list and search for specific opened files. You can enter any number of terms, separated by space, and wildcards are allowed (for example, * to match any sequence of characters or ? to match a single character). This field also has a history drop-down that allows you to select previously used search terms.
Match all terms
If this option is selected, only the files that match all of your search terms will be displayed. If you use a wildcard in the search filter, this option is automatically disabled.
Include file paths
If this option is selected, the search is expanded to include file paths, and also the paths are displayed in this dialog box.
Case sensitive
If this option is selected, the search operation will be case-sensitive.
List of Opened File Tabs
All files that are currently opened are displayed in the main pane of the dialog box. Files that have been modified but not yet saved are prefixed by an asterisk. To switch to a particular file tab, double-click the file or select it and click OK.

Moving Editor Tabs

You can move editor tabs by using any of the following methods:
Mouse Drag
You can use your mouse to drag editor tabs to a new location on the tab stripe.
Ctrl + Alt + Comma
Moves the current file tab one position to the left.
Ctrl + Alt + Period
Moves the current file tab one position to the right.