To create a filter using Collection please go through the following steps:
- Go to your Shopify Admin Store > App > Searchly.
- Click on Filters.
- Select General.
- Click Add New Filter.
- Add Filter Title, select where you want to show the filter (Search & Collection Pages in this case) from Display On dropdown, and select Product Attribute from Create Filter Using dropdown.
- Select Collection as a Product Attribute and click the Save button.
- Run data sync by clicking Data Sync.