The number of top values shown, for each field is not configurable. There is a workaround but it's not recommended as it involves updating core code of Splunk and any upgrade of Splunk will overwrite it.
To expand on the above for the less experienced - if you wish to increase the number of results shown when you click on a field you need to edit this file:
and add a stansa:
required = False
default = 20
As that this is not a documented feature of the product it's also probably liable to change in future releases without notice. The value of your investment could go up as well as down.
search query | top limit=20 host
This will show you the top 20 hosts
Realized this is not what you asked check this:
Thanks for the reply but that does not really accomplish what I am looking for. I would like all of the items under the "selected fields" on the left nav to show all items when I click on it, not just the top 10. Is there no global setting there? How do I get to see the other hosts in that dialog when I click on "hosts" for example?