Extension Advanced search does not display on top of the page

1. Open Extensions page and go to "Advanced search".
2. Do a blank  or wrong search.
3. Open advanced search again.

Actual result:

• The advanced search popup is displayed inside the result window and you need to scroll to be able to fully use it.

Expected result:

• The advanced search to be displayed on top of the page or to extend the results in case of an incorrect search so that it fits the whole advanced search window, without the need to scroll.