In the new El Capitan version of OS X, in safari 9, in fullscreen if you move your cursor to the left, it shows the sidebar.
Is there a way to disable it ?
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Simply copy and paste one or both into Terminal:
defaults write com.apple.safari ShowSidebarInTopSites bool=FALSE defaults write com.apple.safari ShowSidebarInNewWindows bool=FALSE
If you don't want to copy two commands, then you can do both at the same time:
defaults write com.apple.safari ShowSidebarInTopSites bool=FALSE; defaults write com.apple.safari ShowSidebarInNewWindows bool=FALSE
I have found an "solution" Just put your dock on the left side and the problem was resolved. But PLEASE send your feedback here : http://www.apple.com/feedback/safari.html
Just keep using Safari in fullscreen with the dock set to the left side in System Preferences. Enter this command in Terminal without quotes: "defaults write com.apple.Dock autohide-delay -float 1000 && killall Dock" This will fix the issue. Note: the dock will need the "Mission Control four finger swipe up" to show/hide it. To make things back the way they were, enter this in Terminal: "defaults delete com.apple.Dock autohide-delay && killall Dock"