Personalize location placeholder

Hi to everyone.

I am trying perzonalize the display of the placeholder #_LOCATIONALLEVENTS
. I see that it display a list of all events in format: (event – date). I want change the mode in that it is displayed.

I search the files and I see this in em-install.php

'dbem_location_event_list_item_format' => "
<li>#_EVENTLINK - #_EVENTDATES - #_EVENTTIMES</li>
",

I change it to

'dbem_location_event_list_item_format' => "<p><strong>Event:</strong> #_EVENTLINK </p><p><strong>Date:</strong> #_EVENTDATES - #_EVENTTIMES</p>",

but it has no results. How can I personalize the result of this placeholder?

https://wordpress.org/plugins/events-manager/