Can the transparency slider be disabled?

[HelenZhou]

I am going to create a customized slider in my WAB for the transparency for map service layers in my map. Can the build-in transparency.opacity slider in the layer list be disabled ?- see attached screenshot. 

Thanks so much.

Helen

[HelenZhou · Accepted solution]

I just found the solution - In the ..\server\apps\4\widgets\LayerList\config.json, set "Transparency": false.