Make ACF Flexible Content editing the content of each layout using a Modal window.
The button to collapse the layout's elements will be changed to a Edit button, the fields will be opened inside a Modal windows. This will let you order the list of layouts easily and to fill the fields separately.
Free layouts list to order easily.
Modal window to fill the contents.
If you want to name each of the flexible content layout, you can use the ACF hook acf/fields/flexible_content/layout_title.