The problem doesn’t reproduce after deleting the second column panel or deleting a data grid from inside it or some repeating panel or I don’t know what else.
Thanks for the clone link - I can confirm it does not work first time in that app. I find that if you double click a few times, the column widths do reset. I think there’s something specific about this app that’s got it into this state - I’m failing to recreate a similar situation in a fresh app. Are you seeing this often or just in this case?
I only saw this problem on this form.
The original form was much bigger and it happened in many places. I deleted as much as I could while keeping it reproducible.
After a few attempt deleting stuff inside child forms and seeing the problem disappear, I decided to stop digging and report the problem.
I will let you know if I see it again.