The index keeps keywords even when you remove topics that reference them. This way, you can use these keywords with other topics without having to re-add them to the index.
Unused keywords are keywords in the index that are not referenced by other topics. The Index Designer displays them in bold text. If you don't want to use these keywords, you can automatically remove them.
Note: If the keyword you want to remove has one or more subkeywords assigned to it, RoboHELP HTML will not remove the keyword.
Click the Index tab.
From the Tools menu, select Remove Unused Keywords.
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