How do I show the Mini view?

After installing My Calendar, you should have a page in your list of page called “My Calendar”. You can rename this page, so it may not still be named this; but it will be labeled as your calendar page in the page list.

You can configure display options for that page, and that includes setting it to the mini view.

Thanks Joe, for your help. I now have found the My Calendar page and changed the Format setting to Mini. On a test page I have added both the Kalendar widget (but not sure if that is the widget that comes with My Calendar…) and the short code that is on top of the My Calendar page.
This is my test page https://www.verhalenmaker.nl/testpagina-eventlijst/
* The widget has the problem that I cannot go forward to next months, only back in time;
* The short code gives a huge calendar that does not seem ‘mini’ at all to me. By the way, if I change the format to whatever (list, default, …) the calendar stays the same. Maybe because the shortcode stays the same?

I referred to the documentation, but that could not help me further… Maybe you have some more clues?

The widget you’re showing there is the core WordPress widget; it isn’t related to My Calendar at all. There is a My Calendar widget, however. In English it’s called ‘My Calendar: Mini Calendar’.

I don’t know what the exact shortcode is you’re displaying there; but it’s showing the full grid view, not the mini view, and it has multiple months enabled. That could be something enabled in the settings or in the shortcode; there are default settings configurable at My Calendar > Settings, though they can be overridden in the shortcode.

The My Calendar page does show the mini calendar, although, again, with multiple months displayed: https://www.verhalenmaker.nl/my-calendar/

Did this site once have My Calendar installed before? I’m asking because this doesn’t look at all like a recent installation; it has a bunch of options enabled that are not enabled by default – like multiple months, and a very old default theme, etc. That would be possible if it the site had previously used My Calendar, then removed it but retained the old settings.

If that’s the case, I would suggest going to My Calendar > Settings and checking the box “Delete plugin settings on uninstall”, then uninstalling the plugin. That’ll allow you to reinstall the plugin with the current default settings, while keeping your old event data.