To delete Ajax notifications, you have to delete them from the company account. To add a Hub to the company account, follow the steps below:
1º- Access the Hub Configuration -> Installers/Companies and invite the account with which the company account has been previously created.
2º- Once the company has been added to the hub, access the company section (Points 1 and 2), select the "Company" module (Point 3) and go to the "Hubs" section (Point 4). All the hubs that have been invited or registered as a company will appear here.
3º- Select the hub from which you want to delete the notification history (Point 1) and access its configuration (Point 2).
4º- Access the hub configuration, in the Service section and Delete notification history.