To remove the Sortd Add-on, follow these simple steps:
1. Click on the Gmail Setting Icon (Cog) and select Settings
3. Select the Add-on's tab and then select 'Manage'
Clicking 'Manage' will pop-up this screen:
Select the 3 dots options icon and then select "Remove" to remove the add-on
You can also remove all permissions you gave to the Sortd App. See How can I revoke Sortd's permission to access my email?
Lastly, Sortd creates some folders to enable you to import email from your mobile and other email apps. Keeping those labels has no consequence but if you want to delete them you can just remove the "- Sortd ✔" label, and all of the sub-labels will be removed along with it.
Note that you may need to restart your Chrome Browser or at the very least refresh your Gmail tab to fully remove Sortd.