You can change KOrganizer's behavior if you wish. To display configuration window, click on Settings->Preferences. You can get more information in the Preferences window description.
You can also modify the toolbar. Click on Settings->Configure toolbars and read the detailed description.
You can also drag both toolbars around the screen. Point your mouse over the toolbar handle and drag the toolbar to a new place on your screen.
Localisation information like date and time formats can be configured from KDE Control Center within the Personalization->Country & Language module. KOrganizer has to be restarted for changes done in KDE Control Center to take effect.