Panel adjustments are lost upon exiting the program.

I adjust my panes/panels to be the way I want them, but if I exit and re-launch the program, my adjustments are lost. Is this the expected behavior? Or is there a setting that I am missing?

Currently there is only option (menu Tools->Settings->Navigation and Sidebar) to remember left side layout (also be aware of Show on startup option in General settings).

Thanks. I’ve got things situated to where I am happy with them with “Navigation and Sidebar > Remember box layout on left side” and "Appearance > Mail > Uncheck ‘Use compact layout…’ and ‘Always use single-line layout’.