Why Attribute order in Model Explorer is different than in Attribute Editor? How to match order of Attributes in Model Explorer and in Attribute Editor?
Attribute or Column order in Model Explorer (ME) is always in alphabetic order. So if you want the Attribute order in the diagram to match that, you can highlight the Entity and Right Mouse Click to select Attribute Editor. Then you can select the icon below to select Alphabetic which will match the order of Attribute in Model Explorer which is also alphabetic.
After selecting the Attribute order will look like:
However, this will only be like this in the Attribute Editor. In the Diagram display, the display will be same as before. That cannot change as Primary Key (PK) Attributes MUST be above the line and non-keys will always be below the line and these cannot be alphabetized, other than moving then manually.