To delete a Thanks badge, you need to ensure it's not used by neither the active employees or leavers.
If you are unable to delete the Thanks categories:
Click Access Button
then click HR Admin.
Select the Queries tab and click the + icon.
Select Thanks from the left column.
From the right column select Thanks Badge.
Click Next.
Filter Thanks Badge to Non-Blank.
Click Next.
Name the query and click Save.
Select Options and tick Include Leavers.
Then, you need to delete the Thanks badges that are:
Click Access Button
Select the relevant user and click their Thanks tab.
Click the Bin icon next to the relevant badge.
📌Note: In order to delete this for leavers follow the linked article to find leavers' records.