This is intentional, as an empty homepage is not a typical user scenario. You can hide the categories label via custom CSS, or custom JS if you want to hide it only when there are no categories.
Limit Google Adsense on Signup Pages
Currently, I'm using the plugin (nodebb-plugin-adsense) for Google Adsense to show Ads on the forum.
However, it displays the Adsense on all the pages including Signup / Login which is against to the terms and conditions of the Google.
Is there any particular method to place or limit the Adsense on certain pages of the forum.