How to save column widths in mail view?

In eM client when viewing mail I show 3 columns (from left to right) folders, subject, and contents. How can I save the column widths? The column for folders is much too wide. I can change it, but it does not stick if closed and opened again.

This can happen if you have hidden the right sidebar.

Unhide the right sidebar using Menu > View > Sidebar > Regular sized sidebar. Then make the adjustment to the left sidebar (folder list). Then restart eM Client and hide the right sidebar again using Menu > View > Sidebar > Hidden Sidebar.

I think this should be fixed in the most recent release though. What version are you using? (Menu > Help > About).

Thanks Gary. Problems solved with your help