Hi, welcome on this forum where users try to help other users. Please give enough infos about your system (Joomla and JEM) to make it possible to help you.
If you mean with "calendar view" the simple list, then in the settings of this menu you can include or exclude categories.
If you mean calendar view, then in the settings of this menu you can indicate the top category.
Testing JEM 2.3.0 beta3 local on clean latest Joomla (3.9.11) Protostar php7.3.8 (no mails)