In the App options you can set Ajax behavior for:

• pagination - Enables dynamic Ajax also calls in Items view's pagination
• sorting - Enables dynamic Ajax also calls in Items view's sorting by columns
• categories change - Enables dynamic Ajax also calls in Items view's Categories section
• update URL - Enables updating browser's address bar with the search results URL

Additionally, it is possible For search text fields only to enter the time (in milliseconds), after which Ajax call is made, after pressing a key. The field can be left to empty to make Ajax call after the field loses focus.