not possible with stock launcher. you have to use app like Apex or Nova launcher
unfortunately for the op, you are incorrect pinching the home screen only works on samsung products with touchwiz not on nexus products with vanilla android
Valid. I didn't realize this was a nexus only thread. I just happened upon it doing a Google search. My fault.
I immediately switched to Nova Launcher. So much better than the stock launcher while still keeping the main concepts.
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Fortunately for the op, you are incorrect. You simply need to pinch the home screen and it will give you the option to manage the screens.
Can't do it with Kit Kat either.
This,nova launcher has so many options that the stock launcher doesn't have
I'm on 4.3 and add/deleting the home screen for the Z1S is just a long tap near the widgets.