Upon creating a 1-on-1, it is set as a draft. You will hence need to publish it later on or after adding extra details about the 1-on-1.
In order to publish a 1-on-1, within the 1-on-1 single page, click on the “watch” icon beside it. Below is a screenshot on this:
If you wish to set a published 1-on-1 as a draft, you will still need to click on the same “watch” icon beside it.