This option is reachable from the session toolbar in the modification area.

If you use this feature, the program will update the starting time of each talk by adding to the starting time of the preceding talk its duration. The starting time of the first talk in the session is not modified.

This can be use to move a talk among others in a session. Set the time of the talk so that it goes just at the right place, then use "Compute talks starting time".

You can also specify a default free time between 2 talks. Here are some examples:

before (original configuration):	after (free time set to 0 mn):
	after (free time set to 5 mn):

compute talks duration