Prefilters vs. Cross Filters.

Once you've created filters, you can add them to your views as either prefilters or cross filters.

• Click +Prefilter above your chart to refine your data using the filters you created.   
• Click +Filter in your table columns or rows to cut your data by your filters for easy side-by-side comparison across groups (visualised crosstabs).

Example: Cross filters added for "Male" & "Female"

Example: Prefilter by "Regional"

Note that after the "Regional" prefilter is applied, the question's sample size drops from n=825 above to n=262 below.