For managing a ticket template, you were given three options which are view, edit and delete.

Path: Space > Ellipse Icon > Settings > Ticket

Select your desired space to see the Ellipse Icon.

View Template Details

For managing the existing template ticket simply click on the ellipse icon on right of the box and click View to view the details. 

Here you can view the template details.

Edit Template

To edit a ticket template, click the Edit option.

Now you can edit the template and click the Submit button..

Delete Template

For delete a ticket template, click on the Delete option.