hi! i'm a new Business user, longtime Premium user, and i've noted the same thing. In EN Business (MacOS) there is no way to delete notebooks, seemingly.
see screenshot. there's no option to delete the notebook. and i created it.
note the 2nd screenshot, from web version (chrome)- still no delete option
3rd photo- from clicking on the notebook and using 3dots menu... nothing,.
am i missing something obvious here?
thanks! -R