Don't use those buttons to make lists. Both the bullet and number buttons apply the same style and then add local formats that don't stick when the style is reapplied.

To control this you should use the built-in styles that are specific for this. List Bullet is the logical choice. You can modify the settings for List Bullet and expect them to stick. It also has a series of lower levels (List Bullet 2, List Bullet 3 etc) so your list can have multiple levels.

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Andrew Lockton
Chrysalis Design, Melbourne Australia