Where is the render display mode setting in 2.8x? I can't find display mode in 2.8x versions. In older versions when you hit the render button from the navigation there was a display mode option. Now it's gone. 

Where can I find it?
You can access the settings related to displaying the render in the Preferences now (Interface > Editors > Temporary Windows > Render In):



To get to the Preferences you can hit F4 followed by P or go to Edit menu on the Topbar and choose Preferences: