Hi Nadja!
For the separator, there’s normally space on either side by default. You can set this in Events > Settings > Display > “Time range separator” Make sure it has an empty space on either side of the “-” so that it is actually ” – ”
The time you see displayed there will go by your WordPress settings. Go to Settings > General and look at the choices under “Time Format” If you do not see exactly what you want, there is an option to customize it.
Let me know if that helps, or if you have any other questions.
Thanks,
Sky