How do I get Chromium-browser in kiosk-mode, but reduce the screen size

[Frank van Bovene]

In music-player software on linux on a Raspberry Pi, Chromium-browser is started in a Openbox-session in kiosk-mode. That works well.

The problem with Chromium in kiosk-mode however - as far as I know - is that it always starts fullscreen. Kiosk-mode overrides all other sizing settings.

How can I reduce the screen-size (height) and still have kiosk-mode