Remove an app from a site
If you no longer need an app on your site, you can remove it by going to the Site Contents page.
To remove an app, you must have Full Control permissions for a SharePoint site. If you are a Site Owner, you have this permission.
Go to Settings > Site Contents.
On the Site Contents page, find the app you want to remove and click the ellipses (. . .) to view the app properties callout.
In the callout, click the ellipses (. . .) and then click Remove on the menu.