In superlab 4.5:
If i already created all the events, Can i change featchers like the size of the letters or the color of the font for all of them at one step instad of changing it one by one ( for each event)? How can i do it?
Unfortunately, not; it is not possible to edit multiple events at the same time.
Did you use stimulus lists? when using lists, this usually reduces or even eliminates the need to edit many events.