Once you do not want to keep an app on your Mac, you can uninstall Bookmark Sorter by multiple methods.
You can get an app from Mac’s App Store, discs or other websites, and then install it by dragging the app icon to the Applications folder or running the provided installer in the disk image or package file. There are various kinds of software that you can install on your Mac, and it is quite easy to manage those apps on macOS.
How To Uninstall Bookmark Sorter from Mac OS