The "Quick Export" function allows you to generate Reports without scheduling a periodic reporting.
The custom filters are the filters created in the payments section (drop-down menu Custom Filters - Create a new filter), so if they have already been created from that section, they will also be available in the "Filters" tab of the Report section.
Once you have selected the Filters or Models tab, you can see:
By clicking on 3 dots to the right of the Filter/Model, you can see the details or make a copy.
Also on this page there is the "New Filter" or "New Model" button, clicking on which the parameters can be selected.