XF 2.3 How to hide the "Not open for further replies" message for locked threads in some nodes?

[securedme]

I would like to hide the following message block for locked threads in certain nodes.

 

[zenvibe]

The easiest way is with CSS. The "Not open for further replies" block uses the class .blockStatus-message--locked, and XenForo adds data-container-key="node-XX" to the page. So in extra.less:

.template-thread_view[data-container-key="node-42"],
.template-thread_view[data-container-key="node-55"] {
    .blockStatus-message--locked {
        display: none;
    }
}

Replace 42 and 55 with the node IDs where you want to hide it.
If you'd rather remove it from the HTML entirely, you can do a template modification on thread_view. The notice lives inside a thread_status macro in that template. Find:
<xf:if is="!$thread.discussion_open">
And replace with:
<xf:if is="!$thread.discussion_open AND !in_array($forum.node_id, [42, 55])">
Both approaches work — the CSS one is quicker, the template mod is cleaner.