The KPG-D1N gets a bit confusing with this part. You will need to check in two places, depending on exactly how your radio is set up:
Under "Zone/Channel", select "Zone Edit" for which every zone you are scanning in.
Make sure "Revert Channel" option is set to "Selected" or something that includes selected.
Sounds like a Priority Scan would be a good option for you. Set up your Priority Scan to use "selected" channel, which will take you back to whatever your channel/group knob is set to when the timer expires.
Under the "Scan" settings, "Scan Information" tab, there's a bix you can check for "Selected Channel Scan" that may also give you what you want.
The software is challenging, so using the help files can be useful.