try :
index=main auditSource=preferences-frontend auditType=TxSucceeded tags.transactionName="Show Print Preference Option"
|eval Interstitpage=if('detail.journey'="Interstitial",1, 0 )
|eval AccountPage=if('detail.journey'="AccountDetails",1, 0 )
|timechart span=1d sum(Interstitpage) AS ShownInterstitial, sum(AccountPage) AS ShownAccountPage by "detail.ur"
|reverse
or
...|rename "detail.ur" as ID |timechart span=1d sum(Interstitpage) AS ShownInterstitial, sum(AccountPage) AS ShownAccountPage by ID| reverse
... View more