Filter on collection page of Grocia theme

[russel2]

I am finding a solution where I am stuck with filter option on collection. I have a theme name Grocia Theme ver. 1.0.0. As I asked shopify and other developers they replied with a NO, that we can not use filter or metafields beside tags to filter on collection page. My products are mostly jackets and T-shirt. I have used 2 filter application as well but there aren't visible. Is there any app or snippet of code where I can use on my theme?\

Thanks in advance.