Space between groups

Is it possible to reduce space between groups?

You can change the font size of the group headings, or turn on the Group column to remove them entirely.

i don't want to reduce the font size, i just want them to be closer
What do you mean with turn on Gruop column?? to group files, the column must be visible

Unless I am misunderstanding, most of the space between groups comes from the font size:

The column is optional. The screenshot above shows what things look like when it is not turned on. The screenshot below shows it turned on:

but with column i can't collapse groups to save space
is it possibile to scroll more lines than normal? (not changing windows or mouse settings)