When I "Lool group" a group and accidentally add another group, is there a way to undo that created group?

1. What is the problem? Be very detailed.
If I create a repeat group and accidentally I add another group into the loop, how can I undo the selection?

2. What app or server are you using and on what device and operating system? Include version numbers.

Odk Build

I clicked AGREGAR but 'cause was an error and the application create a new create group.

Dear @Cristian_Ceballos_Ro the answer to your question is in the docs