www.dl2rum.de

DX-Cluster: each call sign to announce opens its own window now
for better tracking

I can't get this to happen. What am I missing?

73, John N1JM

Go to the Preferences under "DX Alarm" tab. Enter the full callsign in the section "Call announcements". You can use the asterisk for a partial search.
Enter W1AW and it will be announced: W1AW only.
Enter W1AW* and it will be announced: W1AW, W1AW/4, W1AW/6, W1AW/KL7 ...