/ in the chat to use them.
If you ask the assistant in plain language to capture, group, or rearrange screens, it cannot run those actions itself. It will name the matching command instead so you can run it from the chat.
The same grouping, layout, and screenshot actions are also available from the frame options menu and the multi-select screenshot menu on the canvas.
Grouping
Layout
Screenshots
You can combine the screenshot options to capture exactly the variant you want across many screens in one go. See Screenshots for more on variants.