Menu: Block > Unindent
Default Shortcut Key: Shift+Backspace
Macro function: Unindent()
The Unindent command causes a selected range of lines to be unindented by one Space or Tab character. If the range of lines to be unindented contains lines with varying levels of indent--or mixed indents of Spaces and Tabs--the Unindent command can still be used without concern. Once all of the whitespace on a given line has been deleted, Unindent will not remove additional characters, though it will continue to operate on other lines within the selection with remaining indent.
If text is not selected, Unindent will act upon the current line.