If you're curious:
[code][data-container-key="node-18"] .structItem[data-xf-init^="quick-thread"]
{
display: none;
}[/code]
Change the 18 for the ID of the node you want to hide it from. To hide it in multiple nodes you'd repeat the first line like this:
[code]
[data-container-key="node-18"] .structItem[data-xf-init^="quick-thread"] ,
[data-container-key="node-19"] .structItem[data-xf-init^="quick-thread"]
[/code]
Saying that, it's likely better to do in the thread_list_macros template as it prevents a double border. Pretty sure you'd just change:
[code]<xf:if is="$forum.canCreateThread()">[/code]
to
[code]<xf:if is="$forum.canCreateThread() AND !in_array($forum.node_id, [18, 19])">[/code]
With 18 and 19 being 2 example forums you don't want it in. Haven't tested that though.