It's been about a year since I did a lot of work with fet.
I have the distinct recollection of being able to browse and edit filtered sets of activities, by subject, student, teacher, etc.
But, I've forgotten how, or a configuration setting has changed, or something.
Under "time" constraints ->"all" -> "filter" you can specify whatever you desire...
"time" constraints ->"all" -> "filter" lets me browse and edit constraints.
I want to browse and edit filtered sets of activities filtered by teacher, student group, subject, etc.
In the (sub)activities form there is a filter.