我假设您正在使用VS工具进行编辑.

设计人员不了解ARM参数.为了允许本地编辑，VS工具在某些字段中将ARM参数替换为其值.请在ARM模板中为此参数提供默认值，并且应保留该默认值.

I am assuming you are using VS tools for editing.

The designer does not understand ARM parameters. To allow local editing, VS tools replaces ARM parameters with their value in some fields. Please provide a default value for this parameter in the ARM template and it should be retained.