Membership Pro View - Categories/ Query String

Where can I find the correct syntax of the "Category Query string"?

I need to display only the category ID 2 and ID 5.
I tried to write it in a lot of options in the query space, but the result is always the same: I see all categories, with the number of plans.

Hi Jean

Unfortunately, there is no Query String used for this purpose in this case. I will try to spend sometime to work on it on tomorrow so that you can use filter_category_ids=2,5 in this case.

Will update you on tomorrow

Tuan