Beyond what is shown by default, the dashboard's Content performance section is filterable, and your overall layout is yours to rearrange.
Filter by knowledge base and date range
The Content performance section carries its own knowledge-base and date-range filters, which apply to every widget within that section. These filters reset to "All knowledge bases" each session rather than remembering your last choice, a deliberate default so you always start with the full picture.
Customise your layout
Use Edit layout to reorder or hide widgets within each section. The sections themselves are fixed, but which widgets show, and in what order within them, is up to you. The layout is saved per user, so it does not affect anyone else's view.