Please ensure you do not have the header/footer added directly to the templates.
As previously mentioned, the Fragments are added by Cwicly automatically based on the visibility conditions you specify so you don’t need the fragments/template parts directly in the singular/archive templates.
Also, you may want to add a Show If > all condition first which you then override with the Do not show if condition.
The key aspect of my post was that they are not within the templates directly. Just checking that this is the case for you as that would cause them to appear regardless of the visibility conditions you specify.
@Spipov If you are seeing the Header in the backend of the Index Template and you want to use Fragments you would have to remove it from the Index Template. Otherwise it will repeat and you will have two instances of the header on the frontend.
Singular will target the individual post pages, Archive will target the post archive.
It isn’t 100% clear whether you are wanting to hide the header on one or both of these, so that is something to take into consideration if you haven’t already.