I have no experience with R2L languages but it probably works the same as L2R outline lists.

Outline numbered lists can be configured to either use the same font as the paragraph text or be overridden. Once the override has been set, it can be inordinately difficult to remove.

If you record a macro of a visit to the outline numbering > define new multilevel list then you can have a look at the produced code and tinker with it to get the result you want.

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Andrew Lockton
Chrysalis Design, Melbourne Australia