There is no option for multiple maintenance mode. For example, a maintenance window for a future date is already created in SolarWinds for a particular node, we got another request to create maintenance schedule for a different date and time. When we schedule the maintenance window it is overriding the initial one. Which means we are unable to create multiple maintenance window for same node.
Also, there are no dashboards that display all the nodes with their maintenance schedule. We have to open each node and check the schedule.
Please consider this as a feature request