The History tab is added to the Version Control tool window on invoking the Show History command for a file or directory through the menu of a particular VCS. A new tab is created for each file or directory with the following name: History: <file_name>. The set of toolbar buttons differs slightly depending on your version control system.
All commands available from the toolbar are also available from the context menu of a selection.
Tooltip and Shortcut
Click this button to refresh the current information.
Click this button to compare the selected revision of a file with its previous revision in the Differences Viewer.
Show All Affected Files
Click this button to open the Paths Affected in Revision dialog where you can view all files that were modified in the selected revision.
Show All Branches
Click this button to display changes from branches other than the current one.
Click this button to show the commit message for the selected revision.
Open in GitHub
Click this button to open the page that corresponds to the selected commit on GitHub.