@sewoong_1 As far as I know, this cannot be changed. If I had to take a guess as to why it defaults to last name is because in most cases it is more common for two people to have the same first name rather than the same last name. So, to avoid more results returning, the default is Last Name.
Maybe someone else on this forum has done this, but I'm fairly certain that this cannot be changed.
Thank you,
Kevin Dorsey
SAP Concur Community Manager
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