Blue overlay gets in the way of tweaking the effect levels.
When trying to adjust the amount of effect levels via the channel strip, most of the time you will see the blue overlay. As a user it feels counterproductive, when wanting to tweak the effect levels.

Please see attached screen shot for details.

Additional comment: After a while I then figured out that if you drag the cursor left-right you can also adjust the levels. And then I found out that I could also tweak by dragging the cursor up and down. To me this is a bit confusing as it seems that if you click on the effects, there are two kinds of functions for the same user interactions.

To reproduce:
- Open attached project and launch "AudioMixerTest" scene
- Open the window for audio mixer asset "Ambience" and duck it
- Make sure that one of the audio groups has a send/return or effect on it
- Click with the cursor over an effect on the audio group channel
- Click and drag up and down
- Observe that you will see the blue overlay