You must select your brand attribute in Theme Settings -> Shop -> Brands
Price range: $6.99 through $12.99
Price range: $6.99 through $19.99
Price range: $9.99 through $21.00
Price range: $2.99 through $18.39
Price range: $10.00 through $35.00
Price range: $4.95 through $7.95
Price range: $7.99 through $25.00
Price range: $6.50 through $18.00
Price range: $4.99 through $24.99
Price range: $12.99 through $32.00
Price range: $8.00 through $40.00