I have this plugin installed alongside Advanced Custom Fields Pro.

When this plugin is not active, all the layouts in my Flexible Content field are editable and you can see their names:

When this plugin is active, all the layouts in my Flexible Content field become uneditable and their names are all just “Layout.”

When I click the down arrow at the right end of any of them, nothing happens and if I click “Add Layout” on any of them, the page refreshes and a message appears in a green box that says, “Field group updated.”

This happens to any Flexible Content field that I create, even in a different Field Group. This essentially makes this plugin unusable for me.