Currently I can’t help without direct link to your site and test account 

I have installed Rehub theme for my multivendor marketplace. I use WC marketplace to allow vendors to sign up and upload products.

My issue: on the bottom of the add product page is a section 'brands' and a section 'all categories'. This is not part of the WC Marketplace plugin and therefore they told me to reach out to the developers of my theme.

Can you tell me how I can remove these 2 sections?

All the best,

Tim