I think you are talking about the empire map in your campaign, right? Unfortunately, the Campaign Creator software will not let us access areas on the edges of our empire maps. Sorry.
Now, if I understand you correctly, you said that you originally placed two cities on your empire map but now you cannot click on them to modify them. I think I may know the reason for that. My guess is that you originally used a different empire map than the one you are using now. (Remember, you can toggle through several different empire maps before selecting one to use.) The two cities you placed were accessible on the original empire map you used, but now they are not because you changed the empire map and it did not automatically shift the two cities, it left them on parts of the new empire map that are not accessible anymore. If I am right about this, you can toggle through the empire map selections until you find the one that you originally used, and then those two cities should be accessible to you again. Good luck!
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[This message has been edited by Gweilo (edited 09-05-2018 @ 06:18 AM).]