For long-time users you'll notice a few interface changes recently:
The Settings button above your timeline is now called Appearance and it now focuses entirely on ways to adjust the appearance of your timeline:
With this change, it required moving a few options around that currently were in the old settings dialog: visibility, collaborators, and CSV/Excel import.
You can now change your timeline's visibility by clicking the visibility status above your timeline ("Private" in the example above) which will let you adjust it along with other details about your timeline:
If your plan supports collaborators, you can now manage them by clicking the Collaborators link above your timeline which will give you options for wrangling them:
And last but not least, CSV/Excel import has moved under the Export & Share menu below the CSV and Excel export options:
All of these changes are in preparation for completely revamping the Appearance settings to let you preview the changes before actually applying them to your timeline. Coming soon!