I don’t know what you’ve done in Case-1.odt but this is surely not the standard behaviour. When I type Tab
at the beginning of any or your list items, the left indent of all list paragraphs is increased. Similarly, with Shift
+Tab
the left indent is decreased and the paragraphs can even be sent in the left margin. In both cases, the numbering level is not changed.
In principle, typing a Tab
at the beginning of a list item should change the item level.
Pressing the “increase indent” button, moves the paragraph as a block, keeping the tab in its relative position viz. the left indent. What is not expected is the simultaneous change in all similar paragraphs.
In Case-2.odt, the behaviour is a little better but there are still anomalies. When I press Tab
at head of a list item, the item is promoted to a higher level as you expect for a list item and Shift
+Tab
can’t demote below level 1. Since a level change in a list is controlled differently from an indent increase, the formal left indent is unchanged and tab stops remain fixed in this reference. The actual left indent is customised in Format
>Bullets & Numbering
, takes precedence over what’s defined in the paragraph but will not otherwise influence paragraph attributes like tabs.
If I use the “increase/decrease indents” buttons, I get the same behaviour.
Note also that a list is formatted with two style categories: a paragraph style and a “list” style responsible for the numbering/bullet formatting. The paragraph style is common to all levels and therefore you should expect issues with tab stops (i.e. they are fixed relative to the paragraph left indent and won’t move with the dynamic indents brought in by the list style).
Considering the complexity of the interactions between paragraph and list formatting, I’d recommend to avoid direct formatting, i.e. the use of toolbar buttons, and to design a tuned user style where you control with precision all parameters.
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