Hello @Meher_Chandan ,
To customize the content manager, you will need to rename the folder
extensions/strapi-plugins-content-manager
to
extensions/content-manager.
Do not forget to run in watch admin mode: yarn develop --watch-admin
Also, in the inputs/index.js file, you will have to replace:
const label = isRequired ? ${metadatas.label}* : metadatas.label;
by this line
const label = fieldSchema.required ? ${metadatas.label}* : metadatas.label;
Hope this helps