HTC One User Manual page 230

230 Google Play and other apps
2. Press and hold the event box, and then drag it to an available time
slot.
3. Drag the top and bottom nodes to adjust the event's time duration.
You'll see a message if there are conflicts with other scheduled
events.
4. Tap Done to return to the event screen, and then save your event.
Choosing which calendars to show
1. In any calendar view, tap
(Multi-calendar).
2. Select or clear an account you wish to show or hide.
If you have multiple calendars under an online account, tap
select the items to include.
§ Calendars are synced on HTC One, even if they are hidden.
§ You can also show or hide tasks that you've created on HTC One.
> Accounts (All calendars) or Accounts
to