Costume button can not be unchecked when creating a New Module in Module Def

I’m new to ERPNext and am now enrolled in a training course. I installed ERPNext 14 on Ubuntu 22.04 and completed the processes for building and initializing a new module.

However, while developing a new module, I run into a problem. The system enables me to provide a module name, but there is no place where I can enter the app name. Instead, I can only provide a package name, and the “customize” button cannot be deactivated.

I’m not sure whether this is a typical problem or if there is a better way to set up an app for a module in this version of ERPNext. Any advice or recommendations would be highly appreciated!