If you're a team owner, you can edit your team's data security classification by going to the team name and clicking More options
![Edit team dialog box](https://support.content.office.net/en-us/media/a0587552-c816-488e-8055-e93c9a9be9d5.png)
If you're a team owner, you can edit your team's data security classification by going to the team name and clicking More options