Change default search time for pivots from all time to 24hrs in splunk 7.2.1

[srisahitya_v]

Currently when building a pivot table the default time is set to "All Time".
Is it possible to set it to some other value? I've tried overriding it by
adding the following entries to $SPLUNK_HOME/etc/system/local/ui-prefs.conf,
but they have no effect. We're running Splunk 7.2.1.

[pivot]
dispatch.earliest_time = -7d
dispatch.latest_time = now
[search]
dispatch.earliest_time = -7d
dispatch.latest_time = now
[default]
dispatch.earliest_time = -7d
dispatch.latest_time = now