Manually editing the field display is fairly pointless, as Word will re-set it immediately anything causes the field to refresh (e.g. printing, or print preview).
It appears the behaviour you're seeing is the result of using the \r switch. As documented in the link I gave you:
Quote:
\r
Runs subentries into the same line as the main entry. Colons (:) separate main entries from subentries; semicolons (;) separate subentries. The field { INDEX \r } displays entries such as "Text: inserting 5, 9; selecting 2; deleting 15".
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Thus, the behaviour is by design and there appears no way to change it.