How to enable the Quick Search feature for Strategy Web
1. This feature must be enabled in Strategy Developer: Right-click on the project source ->Configure Intelligence Server -> Web Quick Search, then check the box for 'Enable Quick Search' -> 'Update Index'

2. After selecting Update index, user is prompted with the following message - click OK

3. Restart the Intelligent Server and Web server
4. To view the progress of Index Update / Creation, go to Administration -> System Monitors -> Quick Search Indices

For information on how to How to Disable Quick Search, refer to the following article: KB40303: How to disable Quick Search in MicroStrategy Web