Enabling Code Folding Bar in Xcode

I always encounter this that suddenly I accidentally hide the Code folding ribon. So from @PetahChristian's answer, I captured it with screenshot.

Xcode > Preferences > Text Editing > Check "Code Folding Ribbon"

Go to Preferences -> Text Editing, and click Show code folding ribbon.

Code folding was disabled in Xcode 9 beta 1, which is working now, in Xcode 9 Beta5 according to beta release note: Resolved in Xcode 9 beta 5 – IDE

Here is how:

1. Press and hold ⌘ (command) button in keyboard and move/hover mouse cursor on any (start or end) braces. It will automatically highlight, block area.
2. Keep (hold) ⌘ (command) button in pressed condition and click on highlighted area. It will enable quick menu popover window with Fold option.
3. Select Fold from menu list. It will fold your code and shows 3 dots, folding/covering entire block.
4. Now, to again unfold your code block, release ⌘ (command) button and click on 3 dots folding a block.

For easy understanding, look at this snapshot:

It's all keyboard short cuts are also working.

Fold                          ⌥ ⌘ ←      option + command + left arrowUnfold                        ⌥ ⌘ →      option + command + right arrowUnfold All                    ⌥ U        option + UFold Methods & Functions      ⌥ ⌘ ↑      option + command + up arrowUnfold Methods & Functions    ⌥ ⌘ ↓      option + command + down arrowFold Comment Blocks           ⌃ ⇧ ⌘ ↑    control + shift + command + upUnfold Comment Blocks         ⌃ ⇧ ⌘ ↓    control + shift + command + downFocus Follows Selection       ⌃ ⌥ ⌘ F    control + option + command + FFold All                      ⌘ ⌥ ⇧ ←    command + option + shift + leftUnfold All                    ⌘ ⌥ ⇧ →    command + option + shift + left

Code folding options from Xcode Menu:

Menubar ► Editor ► Code Folding ► "Here is list of code folding options"

Here is ref snapshot:

Same options from Xcode Short-cut list:

Menubar ► Xcode ► Preferences ► Key Bindings ► "Here is list of code folding short-keys"