If the filter rows need to stay inside the flexmonster div, would it be possible to have the ability to show or hide the filter rows. Sometimes we use multiple filter rows and they take up valuable space in the grid causing the pivot table to decrease in size.
Thank you for posting your question.
First of all, let me provide you with the details on how you can hide/show the filter rows using API. Please use showReportFiltersArea option, as follows: https://jsfiddle.net/irynakulchytska/x0o1tz7b/
Secondly, I would like to inform you about the new property pagesFilterLayout that will be released in 2.3 major release to choose the layout for the report filters
This new property might be useful for you in future.