Filters on Queries

hello,
I created a simple query that returns some data from table 36 and others from table 37, so far so good. Now I would like to filter the data, and I would like to let the user do that. I thought it would be an idea to call a page from the query's OnBeforeOpen trigger where you can enter the values ​​and then have them retrieved via a getter:

lpaCheckValuesforDailyReports.RUN();
SETFILTER(Sales_Person_field_service,lpaCheckValuesforDailyReports.rcoGetSalesPersonFieldService)

Problem: The rcoGetSalesPersonFieldService function seems to be called and the query starts before the page opens.
Before that I tried to call up the query via a report, problem: The query is then called up but doesn't stay open, which means I would probably have to save the data. Actually, that's too cumbersome for me, I just want to display the data and then copy it to Excel, for example. I have to say that I'm not quite on you with queries (you can tell for sure).

Kind regards