Pivot table blank row names in groups and subgroups

Hello!
I've been investigating on this issue long time and did not find the answer

I have a structured data table and this structure is for groupping
2.png
How can I get rid of the (blank) rows so they will still participate in calculations
I know I can hide the word "(blank)" and change it to empty value, but the excessive rows will be still there
I want it to be like this:
4.png

Can you help me on this?

then filtered rows will not participate in calculation..