How to increase the width of Macro editor parameter section

Hi Team,

I’ve gone through the tutorial mentioned with https://developer.atlassian.com/server/framework/atlassian-sdk/create-a-confluence-hello-world-macro/ link.

I need to increase the width of the left section of this hello world macro . I need to increase the width of red-highlighed section as mentioned in the attached snapshot ?

Could you please help to suggest how can i do it ?

Thanks