Customization of the "Default section" section within the Specialization's Activities page

Summary:

Hi,

after enabling activity sequencing, a new section appeared on the activity page (in our case called Assessment), is it possible to customize this section? What customizations can be made?

Before enabling activity sequencing the section was not there, but it wasn't possible to add courses to the specialization.
Is it possible to hide the section, without disabling it, without causing malfunctions?

Regards

Francesca