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Go to Node Management and select the Nodes you want to unmanage (You can check them separatly or choose "Check all").
Then go to "Maintenance Mode" and click on "Schedule". You can mute alerts for the desired timeframe (Solarwinds will still poll or atleast try to poll the nodes, but you will not see the alerts) or unmanage the devices (unmanage will completly stop the polling for the entered timeframe). After the timeframe Solarwinds will un-mute/manage the nodes again and everything should be working as before.
Hope this helps.