In each major part of Ethnio, you can specify the from and reply-to of emails, but there are some permission rules that mean you want to pay very close attention to these fields in each area:
The main gotcha here is that each team member can have their own sender identity on the same screener. What this means is that you could have scheduling invites from Mary (firstname.lastname@example.org) and then Jane logs in to the same screener, and invites a participant, but that sender identity by default will be Jane (email@example.com).
This allows multiple team members to invite participants on the same project/screener and still keep their own identity, but if you prefer that all invites have the same sender identity. Not a problem, just make sure your team members know to verify that it is the same when they login. So in this case, Jane would have to edit the from/reply-to to say Mary (firstname.lastname@example.org)
This doesn't apply to Pool because it sits on top of all screeners and saves sender identity per distribution or automation.