This is different from my previous posts "Studio 20.0 crash when saving new table".
I am currently following the tutorial on "Creating a Complete Order Entry System".
I use DF Studio 20.0 and SQL instead of embedded (different from tutorial).
When editing in the data dictionary designer, the properties set in one column get "carried over" to the other table. The same property is set in all columns. When clicking on another property, all properties and changes to this DD are lost.

Restarting the Studio will tix this and properties can again be changed normally.
I can reproduce this as soon as I am in this "state". It works for several different properties.
Unfortunately I can't reproduce this reliably after closing the Studio, but it happened several times with different tables.