Just for testing I added Workpackages table widget to a project overview page. 

Good. But I can not figureout any way to limit number of rows displayed.

It is all nice when you have like 7

https://www.openproject.org/docs/user-guide/work-packages/work-package-table-configuration/configure-work-package-table-268bd5c9.png

But what if you have 27. Where can I specify display first 10 for example?