Dragonfly 2020 version (2002.1 and 2020.2) have a new rendering engine which has different design than the previous versions (4.1 and prior). Please see the explanation below.

In the upcoming 2021 version, we will introduce advanced options for window leveling so that the user can decide how it behaves. 

If you wish to use the old rendering engine in Dragonfly 2020, you can do so by checking off the following option in the Preferences: