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:
{splunk install}/share/splunk/search_mrsparkle/modules/results/SuggestedFieldViewer.conf
and add a stansa:
[param:count]
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.
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