The modern search does not do what is required in every case and the legacy search is slow for large datasets. We have no control over what is happening when a user searches a list page.

Please create a new Trigger on the page like:

OnAfterEnterSearchText(var SearchText): boolean

This would allow a developer to subscribe to this trigger and either modify the text entered and return true to allow the standard search to work or it would allow the developer to apply their own filtering and return false to tell the system to ignore the entry.

This would allow me to program a change for users that want the convenience of searching using the search box but want the results to be a specific filtering (like add wildcards to the entered text and set a filter on the Description field), etc.