When you click "Add Choice" to include an if statement, please change Member of Engagement Program from a boolean true/false, but instead to the name of the Engagement Program.
Use Case - If you can set here the Member of Engagement Program = a Different Engagement program, then you can only pause people if they are a member of that program already. Otherwise pausing someone in an engagement campaign that they are not a member of, adds them to the campaign so they appear in the other's metrics. Not so handy.
It will make things easier if this field is open for the program name. I have dealt with this issue by splitting the campaigns that move people between programs from 3 into 9 campaigns. It does the same thing without adding people to the various programs who shouldn't be there.