Group By filter is a secondary filter that allows you to select your preferred point of analysis when conducting your comparative analysis s. For example, group by retailer or by brand.
The Group By filter is available in 2 modules:-
b) Trend Performance
The Group By filter provides flexibility in choosing a result view that aligns with your analysis goal. For instance, if you would like to view trending patterns for tops instead of trending subcategories in the Trend Performance module, select Pattern in this filter.
Learn more in How do I analyse which material is trending? article.