No option for put in container

Question:
I can not put the arrow inside slideshow repeater in a container like shown in a youtube video.

Product:
Wix studio.

What are you trying to achieve:
I am trying to follow this youtube video https://www.youtube.com/watch?v=q9ToFXslwyI&t=7s as shown on 1:40, to put the arrow inside a container. When I right click on the arrow it does not show the option to do so.

What have you already tried:
I’ve tried to add an empty container and move the arrow into it and it doesn’t work.

Additional information:
[Include any other pertinent details or information that might be helpful for people to know when trying to answer your question.]

This is defo a little a strange - worth reporting as a bug following the steps outlined here - Wix Studio - How to report a bug