There is such a section on metas (filled by employees with the questions they find faq-ish) before the new nav was rolled out; it was appearing on the main page of any metas.
Now, with the new nav being enabled on MSE and SO, I don't see this section on MSE or MSO if I choose the expanded layout. But this pref is sticky, so as I've chosen the expanded layout, any pages would show in expanded layout, including the homepage, which leaves me much less chances to see this sidebar, until I choose the compact one. Moreover, the homepage is still the homepage.
Therefore, I can't see a reason to remove that sidebar if I use the expanded layout.