When grouping items, it would be nice to be able to specify the number of items displayed per group, rather than items per page.
Displaying only 25 (or even 50) items on a page reduces the usefulness of being able to shrink and expand the groups when you have 10s or 100s of items per group. If you could say "show me the top 5 items for each group type (based on the sort order)" instead then you could use grouping to get a more useful overview.
It's particularly relevant when you're looking at hundreds of thousands of notes, where you still want to be able to group by type but the more recent ones are likely to be more important. For example you could display all 5 of your note types on one page, sorted by date so that only the 10 most recent for each note type show up.
