ZBrushCentral

I have a question in ZBrush's custom UI.

I have a question in ZBrush’s custom UI.
I can not delete the Cust1 and Cust2 buttons of ZAppLink Properrties.
How can I turn off the button?

I wanted to attach the CustomUserInterface 2019.cfg file, but I couldn’t.
Thanking you in advance.