How to modifying existing style
Navigate to Styling page in Toolbox dock.
Move the cursor to a paragraph that has the style to be modified. Otherwise, create a paragraph with that style first.
Properties of the style that can be modified are:
font family (select from dropdown menu)
font size (measured in pt)
font style (bold, italic, underline can be set together and on their own)
text alignment (only one of left, center, right and justified alignment can be selected)
line spacing (measured in % of line height for font)
text indent for first line (measured in inches relative to paragraph left margin)
paragraph left, right, top and bottom margins (measured in inches)
paragraph style can be none, or set to another style so that the present style inherits from the parent style
next style can be set to none, the style itself, or another style so a new paragraph created after the present one will have style set to next style
heading level, from 1 - 10
To apply and save the changes, press Modify Style. Changes to a style will apply document-wide to all paragraphs with the style.