You can delete the app downloaded from the App Store through Finder or a third-party tool, iBoysoft MagicMenu.
Before deleting the app, head to Activity Monitor to terminate it otherwise you will receive the message that "The item can't be“moved to the Trash because it's open."
You can delete the app in Finder on your Mac, let me show you how to do it here:
- Launch Finder on your Mac and locate the Application folder.
- Find the app you want to delete, drag and drop it to the Mac Trash.
If you want to move all remnants of this application, iBoysoft DiskGeeker can scan the Mac hard drive and search for unneeded files, then you can remove them comprehensively.