Please revert to the old behavior, where the layout is saved and the last column are lengthened to fill the screen without using a horizontal scrollbar.
You changed the behavior in previous versions so I have to align the columns carefully just to avoid seeing the scroll bar.
Now in version 2.59, even that is impossible-as soon as I exit Tixati, the layout reverts.  
This is especially important to Linux users as tiling WMs are still a thing.

I confirm the latest version does not save columns sizes, at least on Linux.

this will be fixed in the next version, which is coming very soon...