Events+ in the settings only a few visible

I started in the settings of events+ just fine - with the whole screen of options to choose from, to activate.

When I activated the 'additional fields' option - the screen refreshed (like it did every time when a new option was activated) and all of a sudden there was only 4 settings left to change;

plugin settings
appearance settings
event colours
additional fields

That's it - the settings tab is not showing anything else.

Hope someone can shed some light on this
Thank you