How to remove the post button in a search forum?

[securedme]

For example, the following forum is a search forum. https://xenforo.com/community/search-forums/resolved-bugs.109/

I tried to add the following code to my extra.less but nothing changed.

Code:

[data-template="search_forum_view"]
[data-content-key="search_forum-109"]
{
    .p-title-pageAction {
        display: none;
    }
}

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