You can use features of the search language to remove unwanted fields from the reports.
For example (the ... is the actual search command like "search index=main *" then "pipe to" using "|".
Remove the "host" and "ip" fields.
... | fields - host, ip
Keep only the "host" and "ip" fields, and display them in the order: "host", "ip".
... | fields host, ip
Keep only the fields 'source', 'sourcetype', 'host', and all fields beginning with 'error'.
... | fields source, sourcetype, host, error*
etcetera. There is a easy-to-digest summary here: http://docs.splunk.com/Documentation/Splunk/latest/SearchReference/SearchCheatSheet
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