To edit the dashboard, select the dashboard you are currently interested in, click Options, and then Edit dashboard.
On the edit page, you can delete unnecessary metrics by clicking on the trash can icon in the upper left corner.
You can also expand the dashboard by clicking on the Add metric button.
After making all the necessary changes, click the Update button and in the pop-up window that appears.
Here you can change the name of the dashboard and click Update again (if you want to leave the name unchanged, click on the button on the pop-up window immediately).
