<span class="peertube-plugin-livechat-warning"> You have enabled the setting «Users can activate the chat for their lives». It is redundant with the «Activate chat for all lives» setting. </span>
If checked, anonymous Peertube users won't see the chat. This feature is still experimental. If you enabled it, it is highly recommended to also check "Don't publish chat information". Otherwise, some third party tools could try to open the chat, and have unpredictable behaviours.