In Ready API Tool - Not able to Add sections in Request -> Form (Tab)

I have added a new field in the API request but not able to add the new feild details in the Request -> Form (Tab) all the sections are disabled as per the screen shot.

Can someone help me on how to add the new section to add the new fields in the Request -> Form (Tab)? 

Also, in the API request View Type -> All  is selected from dropdown but still the data is viewed as clutter sections and feild details not able to see section and fields in the proper form (as per attached screen print) . How to resolve this issue?