On Mac OS new windows don't immediatly appear on the second screen.
Right click Firefox in the doc, Open a new window. Move it to the second screen. Firefox is no longer the active app on either screens Right click Firefox in the doc, Open a new window. wait about a minute and it will open on the second screen.
Could this be better?
mac OS 10.12.6, 27" iMac 5K retina display 2017 (just out of the box) Second screen is USB connected Dell U2410.
Right click Firefox in the doc,
Open a new window.
Move it to the second screen.
Firefox is no longer the active app on either screens
Right click Firefox in the doc,
Open a new window.
wait about a minute and it will open on the second screen.
Could this be better?
mac OS 10.12.6, 27" iMac 5K retina display 2017 (just out of the box)
Second screen is USB connected Dell U2410.