I think what you wanted was X? Please note that X and Pro are separate products.
X is the basic and version but includes the demos you can see at https://theme.co/x/demos/
Pro has the Header and Footer builders which means you can achieve a custom layout and add elements for and to your header and footer. It also includes the Design Cloud.
Envato Market and Apex are also completely different sites. Envato Market is a marketplace not controlled by Themeco (us) while Apex is the portal provided us for a variety of purposes including product support.
With your current situation, I'd recommend that you continue with Pro and not X.