You can grab the button bar and slide the window up and down, can't disable that. When you let go and your finger is below where the button bar was then it will unmap. The setting determines how the window unmaps after you lift your finger.

Try this, press escape while ASUI is open, does it vanish or does it slide down the screen. The setting is working if it vanishes.

This feature is required so you can drag the ASUI window down a little (but not unmap it) to see the new BME drain indicator that is finished and will be tested and released when I wake up tomorrow.