The object you want to edit is an instance of a component. You can see that by the purple color. You can’t change the order of elements in a component. You have to detach the instance with alt + cmd + b (or ctrl + b in windows), than you can change the order of auto-layout objects and other stuff.
Hello,
Empty diamond shape in purple is representing that the component is a instance/child of parent component. You can right click on that component and select ‘Detach Instance’ or use shortcut keys ‘Ctrt+Alt+B’ so that the component will no longer be associated with the parent component and changes can easily be done according to your needs.
Coming to 3 vertical lines, this represents that ‘Auto layout’ property applied to the elements within that layer. You can change these properties from the property panel located on right side of the screen or select ‘-’ option, next to auto layout property, to remove the property of selected element.