<p>You can call <a href="https://developer.gnome.org/gtk3/stable/GtkLabel.html#gtk-label-set-angle" rel="nofollow"><code>gtk_label_set_angle(label, 90)</code></a> to make the tab like that. It would probably be prudent to do it from a callback on <a href="https://developer.gnome.org/gtk3/stable/GtkNotebook.html#GtkNotebook-page-added" rel="nofollow"><code>GtkNotebook::page-added</code></a> so it can be automatically applied to each tab like those added by plugins.</p>

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