Hi Kaspars,
while there are open enhancement requests for this, there is currently no way to make the item per page setting permanent. I usually recommend removing the Default pools if they are not actively used.
DP 9.05, GUI, pool depiction and "items per page"
https://softwaresupport.hpe.com/group/softwaresupport/search-result/-/facetsearch/document/KM02158970
Please use the Accept Solution button next to my post and assign a KUDO (thumbs up icon) if this works for you.
Regards,
Sebastian Koehler