You have selected an organisation to edit it and are in the navigation menu on the left under "Assessment". You will see a number to the right of the navigation point. This indicates how many assessments are assigned to this organisation.
On the right you will see an assessment list with all the assessments assigned to this organisation.
Here you have the option of searching through the list and filtering it according to certain criteria.
You can also create new assessments in this organisation and edit existing assessments in this organisation.

If you create an assessment within an organisation, the organisation-specific branding is automatically applied.