We previously had a similar issue, which resulted in the introduction of additional values:
https://www.drupal.org/project/drupal/issues/3083379 →
While those changes improved the flexibility of Views block management, we still lack several basic options, specifically, values like 8 or 9.
It's a common practice to use grid layouts with 3 or 4 columns. In such cases, having the ability to display 8 items (2 rows of 4) or 9 items (3 rows of 3) is essential for creating comfortable layouts. Currently, this isn't possible, as there are no available values between 6 and 10.
The only workaround is to set the number of items (8 or 9) in the default view configuration. However, this isn't a viable solution when the same view block is reused in multiple places with different layout needs.
Extend the list of available values to include all integers from 1 to 10. This change would give site editors more flexibility and allow for commonly used layouts like 3×3 or 2×4 without relying on workarounds.
Needs review
10.5 ✨
views.module
Probably something that will need sub-maintainer sign off.
But probably should have test coverage too.