Slack 2.17.0 Release Notes:

Highlights:

• The act of adding team members to a private channel will now prompt you to either invite them to the current conversation (where they’ll see the channel history) or create a new private channel (where they won’t)(because there won’t be any).

• On large tablets the side drawer will now remain open, for easier rummaging.

Full Release Notes:

https://slack-files.com/T12KS1G65-F266URYUE-00f88cd849