Please take a look at the attached screenshot above. In the “Danger zone” section (this is the very bottom of the “Conversation settings” window), I only see the options “Archive conversation” and “Leave conversation”
Yeah, I just picked a contact from the “All contacts” list and started a new conversation. I’m not sure what a moderator is, but I tried it with regular accounts I created for my friends on my server, as well as with the admin account - and this section looks the same no matter which account I use or which client (web/desktop/iOS).
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1-1 conversation cannot be deleted/cleared by default. If you wish to do that, you need to use a recent version (I think it was added in 31) and set the following config
The base idea is that one participant of a 1:1 conversation should not be able to delete the whole conversation as there is noch such thing as moderation. But in case it’s wanted, there’s an option for that.