I understand you are looking to implement Fast Simon on your Shopify OS 2 theme.
Please follow these guides depending on the feature you wish to implement. All work great with the new OS 2!
1. Autocomplete search suggestions & search results page
Please follow this simple step-by-step video guide: https://www.youtube.com/watch?v=6ifY6Zz_Oqg
And make sure to disable the theme's built-in search suggestion from Theme Settings:
2. Smart Collection with filters (match design with search)
Please follow this simple step-by-step video guide: https://www.youtube.com/watch?v=beBnBxc-QmQ&feature=youtu.be