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Same place as snaps. Sometimes (mostly with top-level threads) inleo sort out content made on threads via other frontends
!BBH

Actually, I prefer to use InLeo in threading because threaders are more active.

That's true. But you can view the same content, the threads, directly from peakd. Like their snaps, just right below that in the menu

Yes, I saw that. I am just curious about the difference in visibility and engagement between creating threads on InLeo and on PeakD.

Top-level created from peakd is hidden on the inleo UI, as far as I know.
Replies may be visible, I guess it depends on rep score, but I don't know for sure (this reply is made via ecency)
!BBH

A snap made on PeakD is not visible on InLeo. I will test later in the case of threads made on PeakD.

A thread made from peakd is not visible either on inleo. At least not the top-level ones
!BBH