At the moment you can not change a recurring events, except changing the database itself.
I have events that occur every year.
How do we set event recurrence settings “By the end of “ to unlimited or how will we extend event recurrence ?
I think that an older version of JEM had the option to "infinite" repeat an event. But don't know why it is gone.
As solution, just set up to repeat the event unitl year 2100?
I´ve set Generate Events up to (days): 365, will this limit the generated events in 365 days even if “By the end of “ is set to unlimited ?
Yes.
For understanding "generate event up to" as I understood it:
For example you call dayly your website at 18:00h. If this option is set to 14days, JEM will every day on 18:00h check for repeating events in the time span from this time 18:00h up to 18:00h in 14 days and will create new entries.