The elements of your current page or component are gathered in the elements tab in the left sidebar.
You can change element's name with double click
And you can sort elements through the list by dragging up or down.
Also, it is possible to remove an element from a group and insert in another one by dragging it
Element breakpoints are shown when the element is selected and you can set the visibility property via the eye icon.
When an element is hidden, it disappears from the view frame so it doesn't get in the way of creation, but you can find it through the list by hovering over the element's name.
To delete an element, you can click on the remove icon on the right side or select all the elements you want to delete with the shift key and press the delete key on your keyboard.