As well as all action parametres, the options concerning formatting of lists are set in dialogue "Options" on a tab "Parameters".

Use tab for indent
Necessity sign to use a symbol of tabulation for maintenance of indents.

If this option is switched off, instead of tabulation symbols groups of blanks are used. The size of such groups is defined by adjustment TabSize option.

Default value - on.

Tab size.
the Size of tabulation influences not only operations Tabify/Untabify:
  • In operations of change of indent the size of a indent is established equal to the size of tabulation.
  • all the line long the numbered paragraph, move to the right for the size of tabulation concerning the first line of the paragraph.

      Value of tabulation size by default – 4 .