On version 7.X I would run the window in the editor adjust the columns then stop the editor and save the project. That would usually work to “lock” the column sizes the way I wanted. I really didn’t change any of the column sizing flags. Sometimes the column sizes would not be what I wanted, but usually they would be.
That trick does not seem to be working in version 8.x.
I get the feeling that I’ve been doing it wrong and am looking for the correct way to set column sizes on the power table component.