By design, the purpose of this view is to revise the already created schedule. The entire view is not editable and has no slots, unlike the other views, which are made with this purpose in mind.
While the previous reply from my colleague described how to manually achieve editing in the Agenda view - I would suggest you log a feature request in our public feedback portal, containing your idea and a brief explanation of what you expect to have as a layout in that view:
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