Tab and Indent dialog box
In this dialog box, you can set the tab and indent options. You can invoke this dialog box using Tab/Indent command.

Tab
Specify the tab size.
Indent
Specify the indent size.
Insert spaces instead of tab
Check this option to insert spaces instead of a real tab character when you press TAB key.
TAB key moves cursor by indent size
Check this option to make the TAB key moves the cursor position by the indent size rather than the actual tab size.
Enable auto indent
Check this option to use the auto indent feature.
Auto indent open
Specify an optional character which increases the indent. If you press 'Enter' key after this character, The next line will be automatically indented. Only one character is allowed in this field.
Auto indent close
Specify an optional character which decreases the indent. If you enter this character in the document, the line will be automatically un-indented. Only one character is allowed in this field.
End of statement
Specify an optional character which indicates the end of a statement. If you press 'Enter' key before this character, the next line will be automatically indented. Only one character is allowed in this field.