To manage a snippet, you have three options which are view, edit and deactivate.

Path: Space > Ellipse Icon > Settings > Snippets

Select your desired space to see the Ellipse Icon.

View Snippet Details

Manage the snippet by clicking the ellipse icon and click View to see the details.

Here you can view the snippet details.

Edit Snippet

Next for edit, click on the Edit option.

Edit the snippet name and content and click the Save Changes button.

Deactivate Snippet

For deactivating just click on the Deactivate option.