Edit Layout of Data Fields for Vivoactive HR Pool Swim

Hi, I am trying to use a third party data field for the Pool Swim built-in app, but there is no way to edit the layout of the data fields for Pool Swim. The default is 3 data fields. For the Bike built-in app, you can change the number of data fields in the layout (1, 2, or 3). It is under Settings > Apps > (choose app) > (app) Settings > Data Screens > (choose screen) > Layout. For Pool Swim, when you tap Data Screens, it shows you the default 3-field data screen and you can edit each field. I want to edit the number of fields (1 instead of the default 3). Please change the Pool Swim built-in app so you can edit the layout of the data fields so third-party data fields can be more versatile. I am using a Vivoactive HR watch, software 5.00. Thanks