We’re working hard on adding Outline support to the CodeMix TypeScript editor (and other editors too) – this issue is being tracked here: https://www.genuitec.com/issue-tracker/33044/ and should make it to a release soon.
Pressing Ctrl + O
should definitely work though, and bring up a local symbol search in the command palette – is this not working for you?
To go back to the Webclipse TypeScript editor, you can choose Open With > TypeScript Editor (this is the Webclipse TypeScript editor) or deselect TypeScript at Preferences > CodeMix > Languages > Preferred Editors.