You have 2 options to hide collections:
Hide a single collection in the Shopify admin
Hide a lot of collections or a single collection in Rapid Search admin
#1 - Hide single collection in the Shopify admin
- Navigate here: Shopify admin > Products > Collections
- Open the single collection you want to hide
- Click on "More action" and choose the "Hide collection from search"
- You are ready. The selected collection will be hidden in 60 seconds.
#2 - Hide a lot of collections or single collection in Rapid Search admin
- Navigate here: Shopify admin > Apps > Rapid Search > Settings > Advanced
- Click on this button: "Select collections to hide"
- Select collections you want to hide and click the "Select" button
- You are ready. The selected collections will be hidden in 60 seconds.
Relevant support articles: