How can I change the filter condition in my theme?

Store Design
1

Hello everyone,
I need some help, I couldn’t figure out how to change the filter condition from my theme.

For the moment, When I’m selecting 2 size filters, my products appears with the condition AND but I want to change with OR.

https://gist.github.com/kousto/edbcbcb0021e024311eaee0fe4b7d436

Thanks in advance for your help
Kousto

2

No one knows ?