As suggested by Harvey you can liquid comment (or remove) results output from the Web Template (but make a copy of it first),
But, I am not sure if there are different names based on versions or different starting Templates - for the Dynamics 365 Customer Self Service template that I installed the other day (not enhanced) it outputs via the "Case Deflection Results" Web Template.
(you can work out what it uses by working back from the short name in your Portals url, get the Web Page for that short name, go to the localized version of that Web Page, then go to the Page Template in a Looup on that Web Page, then what Web Template that Page Template uses, then look for the output or another Include of a different Web Template in that template etc)
Not sure if its actual deflection search is controlled by the other Search settings or not, but this link has most of those settings https://learn.microsoft.com/en-us/power-pages/configure/search/overview#related-site-settings
Edit: just adding a bit more, in the Web Template that I have named "Customer Service-support case deflection" which towards the end includes the 'Case Deflection Results' template there is an "input" tag that has a property "data-case-deflection-logicalnames" I am not 100% sure but it may be using the values in that property as the list of Tables to search.
And, as there is a lack of documentation, once I found the property I used Copilot and its response was
The data-case-deflection-logicalnames input property in the “Customer Service-support case deflection” Web Template for Power Pages is used to specify the logical names of the Dataverse tables that should be included in the case deflection search. When a user interacts with the case deflection component, this property determines which tables the search will query to find relevant information before a case is created.
This allows for a more targeted search experience, ensuring that only the most pertinent tables are searched to provide suggestions or answers that could potentially deflect the need to create a new case. By configuring this property, you can customize the case deflection feature to better suit the specific needs of your organization and the information structure of your Dataverse environment.
If you need to adjust which tables are included in the case deflection search, you would modify the value of this property to include the logical names of the desired tables. Remember to separate multiple table names with commas if you’re including more than one.