
Explanation:
Box 1: 2
One for each visual.
Note: When you edit a report in Power BI Desktop and the Power BI service, you can add report bookmarks to capture the current state of a report page.
Bookmarks save the current filters and slicers, cross-highlighted visuals, sort order, and so on.
When others view your report, they can get back to that exact state by selecting your saved bookmark.
Box 2: Display
Users must be able to switch between the views by using buttons on the report page. The selected Chain field must be maintained when switching between views.
You can select whether each bookmark will apply Data properties, such as filters and slicers; Display properties, such as spotlight and its visibility; and Current page changes, which present the page that was visible when the bookmark was added. These capabilities are useful when you use bookmarks to switch between report views or selections of visuals, in which case you'd likely want to turn off data properties, so that filters aren't reset when users switch views by selecting a bookmark.
Reference:
https://docs.microsoft.com/en-us/power-bi/create-reports/desktop-bookmarks