The Operation branch under Configuration - Application Layout - File Tabs has the following options:
Dockable tabs
If this option is selected, the file tabs will be displayed in a dockable control that may be moved outside of the main GUI and arranged and resized as desired. If this option is NOT selected, files cannot be cascaded or tiled using the relevant Window menu commands.
Types
Single line - scrollable
If this option is selected, file tabs will be displayed in a single row. When the file tabs for the number of files opened exceeds what can be displayed on a single line, left and right scroll arrows will be displayed at opposite ends of the tab row.
Single line - drop down file list
If this option is selected, file tabs will be displayed in a single row. In this mode a list of currently open files may be accessed by clicking on the down arrow at the end of the tab row.
Multiline
If this option is selected, the number of lines used to display file tabs for the open files will automatically expand and contract as necessary based on the number of open files.
Close Tab Button
Users may select one of four options related to the display of an "x" close button for file tabs. If None is selected, a close button is not displayed. If On tab bar is selected, an "x" will be displayed at the end of the file tab row and users may click on this to close the active file. The On tab bar option is subdued unless the Single line - drop down file list file tab type is selected above. If On active tab is selected, an "x" will be displayed on the active file tab. If On all tabs is selected, an "x" will be displayed on all file tabs.