First time seeing this. Also how to disable que all new torrents get into?
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If you see a lock icon next to a name, it indicates a 'private' torrent. This means DHT and PEX will not be used for this transfer. This is meant to control access to the swarm via the tracker.

But there are these 2 Hotkey commands:

ctrl-shift DPF when comments are focused will remove private flag
ctrl-shift DPP when comments are focused will remove private flag and disable PEX