To remove a monitored system in Pulseway, you indeed have two common methods.
1. Delete a device individually
Please open the Pulseway WebApp and navigate to Configuration →Organization.
Expand the required Organization→ Site → Group → Systems. Click Edit and remove the systems that should not be listed there.
Remove the systems which shouldn't be listed there.
2. Bulk action (Delete multiple devices)
Systems can also be deleted from the Device>Device Management section of the Web App. Select the device, go to Actions, and click Delete Device.
In this section, the User can also view the "Last Seen Online" timestamp of each device, thus enabling the User to delete systems that have not come online for a substantial period of time.
Note: that the system, which are you deleting should be online at the time when are you deleting it, because if the system is offline at that time, then the reconfigure command will not be sent to that system and that system will re-register with our account as soon as it will come back online. However if the system no longer exist, then simply delete it.