In the Screen Resolution window, under Change the appearance of your displays , click and drag one of the monitors to its correct location vs. the other one. The Identity numbers don't matter.
How to Swap Display Identity (Identities)
Windows 7 - Display 'A' Philips primary display - Display 'B' IBM secondary display. A shows as Identity 2 and B shows as Identity 1. I want to reverse these. Reason is that the cursor currently travels from display B to A and I need it to go the other way - due to physical location of displays
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Anonymous
2017-12-28T17:25:50+00:00 Agreed, the identities are very important. However I think we have to face facts. Even though this is clearly a software issue (Windows XP could change the identities and Linux still can) I think we will never get Microsoft to change this because it appears to be a design decision in Windows 7/8/10.
They are aware of the user request (as it is nearly a decade old with regular updates from people asking for it to be fixed - basically since XP went away)...
It will never be fixed because it is very likely a very low level feature and it may cause millions of bugs if they attempt to find every line that is affected and change it (I assume they make a reference to physical hardware in the code rather than abstracting it to a variable so every reference would need to be changed which is very likely impossible.
Lesson to folks who write software (if this is the real problem): never hard code anything...