How to block Edit icon?

Hello,
in my configuration there is an issue with edit / delet of events that do not belongs to the logged in user. this is unfortunately possible via small menu shown on the left side displayed by event (dhx_menu_icon icon_edit).
to reproduce - set up privite extended mode, create 2 events by two diff. users. try to change the evnt from another user -> click first on event, then on shown edit button (edit the text, save), then on still shown delete button, confirm deletion and … event is deleted!

the easiest way would be to don’t show the left side menu on the click on even from another user, however all tries are unsuccessfull.

i came to another idea:
to don’t allow to edit text right in event and to don’t show dhx_menu_icon icon_edit at all.

Where can i block it?

thank you!