This would only show the main comment, but not the replies to it.
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Their github can be found here, to search for existing enhancement requests and submit new ones:
Dessalines recently said, he and the other main developer of Lemmy and jerboa do not have enough time for coding enhancements right now and wanted less of them to be put in as issues in the tracker.
So all child comments are collapsed?
If by a child comment you mean this reply then yes.