On Yosemite how can I turn off notifications on Yosemite while presenting or showing the screen to someone?
I know I can set the do not disturb for a time period but I was wondering if there is just an on off switch without having to set a time.
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You can either use the System preferences- Notifications- and use one of the options there that suits your need to turn OFF.
Or you can use keyboard shortcuts, in the syst pref- keyboard- shortcuts, and assign a short cut that will turn On/Off the Notification (keyboard is faster) but you have to remember the short cut.
There is also this method https://apple.stackexchange.com/a/154563/46541