The author has unusually(?) I've left out the summary.

This LORA is a "6+girls" or rather "multiple girls" slider.

The range is from -3 to +1. Below -4, the girls are clustered. Above +2, only one person will be shown in the close-up, and only the part of the image will be shown.

The general effect of Weight

-3: A crowd begins to form. The Character is still standing in the center; there can be as many as 20 people.

-2: More than 6 people are generated, sometimes as many as 10.

-1:About 6 people are created, sometimes as few as 8.

+0:Generates about 6 people, sometimes less than 6, depending on 6+girls.

+1:Sometimes 3 or 4 people are generated. Sometimes less.

+2: Solo. Nonsense. Feel the sadness.

Concept of different number of girls, I would say. Usually the most common art is 1 girl per picture, so maybe it works like "slider of ordinarines", where big weight is the most common result and negative is the most rare cases with big group of girls. Who knows... ¯\_(ツ)_/¯