Got a workaround
Go to Settings -> All Settings -> Node & Group Management -> Manage Nodes -> Group by: Location (This is not really ideal but it works, my instance is missing groups on this part which I don't know why...)
-> Click on the box on the header to select all nodes and put into maintenance mode.
Other options would be creating a custom property with group names and select that on the Group By Filter.
I hope there's an easier way to do this.
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