Height of Detail Grid

I am coming for help again

I have a Master detail set up. The detail is a multiple record form. It is only showing four lines at a time although it is set to 30 lines the link set up. I would really like it to open up with much more height. It’s obviously very cramped as it is. Any ideas, please?

How many records do you have in detail form?
If you have only 2 is going to show 2 even if you define 100. Until you have 30 or more.

If you want to see more space you must to define the height 500 px for example for the detail form.
Or you must use Multiple records form.