keyboardmacosmission-controlspaces
Just a simple question – my day-to-day setup is a MacBook Pro with 2 connected external displays. I want to try to organize my different "tasks" (writing code, testing/web browsing, and notes) into different Spaces. The keyboard shortcuts to change Spaces only take effect on my currently-selected screen.
Is there a way to change Spaces across all displays at once? If not with a built-in function, maybe a third-party app?
The built in methods for changing shortcuts are less limited than you think.
Go to the Exposé & Spaces preference pane in System Preferences, and check out the bottom section of the preference pane. Note especially the text just above it:
Keyboard and Mouse Shortcuts (for additional choices press Shift, Control, Option, or Command)
Here's me pressing ⌃⇧⌘ (Control + Shift + Command) while the shortcut drop-down is active:
The shortcuts have the keys I'm pressing added to them (well, sort of, it avoids redundant combinations but its very easy to see how it works and choose exactly what you want).
So for ctrl+alt+arrow keys, open the drop-down, press ⌃⌥ (Control + Option) and you'll note the top item becomes the shortcut you're after.
You can also do the same for the shortcuts to switch directly to numbered spaces or for the Spaces activation shortcut.
In the dock you can right click the application, go to Options and de-select the option there.
Best Answer
There's a System preference for this, but then it makes fullscreen apps occupy only one screen at a time and the rest of the screens are black. To activate it:
Preferences -> Mission Control -> uncheck Displays have separate Spaces
reference: Apple site