Hi
If you are still using Easislides 4 please upgrade to easyslides 5.
For easyslides 5:-
The names of the list of screens in easyslides is not the same as the ones displayed in Windows.
1. In your Windows display settings, take a note of live screen position, ie. is it on left/right/top/bottom of the main screen, and work out the location co-ordinates.
2. In easyslides settings->screens->live screen tab, there is an information icon which will tell you the location co-ordinates of your selected screen. Use that information to select the appropriate screen to match the information from step 1 above.
If all fails, you can select custom screen option and manually enter the live screen location co-ordinates.