Mac – Mission Control Won’t Open and How Do you set up control + up arrow to make it work

Mission Control replaces them.

All the things that you used to be able to do in expose and spaces should be in Mission Control as well (Well... Not really, you can't have spaces arranged in two dimensional space anymore).

But no, there's no more Spaces or Expose anymore. Yes it's called desktop now.

Here's something I tried (on 10.9.5). Unfortunately, it didn't work, but I'll note it here in case it inspires someone.

• I noticed that enabling System Preferences > Keyboard > Shortcuts > Switch to Desktop 16 caused ~/Library/com.apple.symbolichotkeys.plist to update.
• I found some information (1) (2) about that plist.
• According to that second link, "Switch to Desktop 1" is action 118.
• I tested enabling / disabling Switch to Desktop 16 in that System Preference pane whilst looking at the plist file, using /usr/libexec/PlistBuddy -c "Print :AppleSymbolicHotKeys" ~/Library/Preferences/com.apple.symbolichotkeys.plist and, as I expected, the "enabled" value for action 133 (=118+15) changed.
• I added a value for action 134 based on action 133, which I hoped would cause ctrl-alt-6 to switch to Desktop 17: defaults write com.apple.symbolichotkeys AppleSymbolicHotKeys -dict-add 134 "{enabled = true; value = { parameters = (65535, 22, 786432); type = 'standard'; }; }" Unfortunately this doesn't seem to have any effect on my system.
• So: I think that the symbolichotkeys plist file contains a mapping from key presses to actions. The actions include Switch to Desktop 1 through to Switch to Desktop 16, but there are no corresponding actions for desktops with higher numbers. Sorry!