I would like to have my attributes in alphabetical order. Do I need to do it manually or is there a way to do it automatically?

There is a way to do it automatically. Right-click on the Logical Model canvas and select Sort Attributes. You can sort them either ascending or descending.

 

 

But are you sure you want them to be in alphabetic order? Usually it is easier to understand the model if the primary key attributes are first and usually we define the mandatory attributes in the beginning of the list.