1. You can't. 2. You can use the filters at the top to show you only the events you care about, or remove the ones you don't. There's also a "Before" filter to go back in time, but that's about all you can do. Your other option is to enable Syslog on the devices and send all the logs to a Syslog server. From there you can use your favourite log management tool to get done what you need.
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