Update: Possible short term fix and workaround solution to the above issue.
it seems in my case to be related to an extended-second screen running at a different, in my case, lower resolution to that of screen 01.
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I placed the UE4 editor into the second screen and the viewport/game window in the screen 01.- Only working on one screen
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I matched (over clocked via graphic settings) screen 02 to match screen 01 “Can`t right-click” Issue fixed
This actually makes sense when you think about the editor being split into two entirely different resolutions
I still need to run through a few more repeated scenarios before confirming anything but will be worth a try your end (The user).
Let us know
Steve