This can be configured very easily.
When you Insert
>TOC & Index
>TOC, Index or Bibliography
or, equivalently on an existing TOC when right-clicking and Edit Index
, go to the Entries
tab.
You can describe in Structure & Formatting what you want in the TOC entry lines. The chapter number (what comes from Tools
>Chapter Numbering
, i.e. the number and other decorators/separators) is coded as E#
. Click on it and press Del
.
Repeat for every level you want to customize.
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In case you need clarification, edit your question (not an answer which is reserved for solutions) or comment the relevant answer.