Filter field in Configure Dashlet - How to enable?

We are testing the “Save Filter” within a report (very nice).
It would be great if these saved filters could be available on the dashboard when the report is added as a dashlet.
It appears to be in place but the “Filter” dropdown is disabled even though the particular report has some saved filters.

Is “saved filter” capability still activated in integrate?
grafik

It should work:
grafik