Can there be the option to Show/Hide the toolbar? And also an option to hide the lower toolbar? Reproducible: Always
See Bug 210620 . Also, one issue per report, please.
The main toolbar under the menu bar is a standard one, so you can always show and hide it the way you can with all other such toolbars in KDE apps. What you're calling the lower toolbar would be the status bar and that is now hideable, too.