isabelle1786 Said:
”[...]Can I delete the 1st user and keep the 2nd user? Will home folder be changed accordingly after the name of 2nd user?”
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Prior to This: Back up your Mac:
If this were me, I’d go about creating a Time Machine backup a of my Mac, so that I can have something to restore my Mac from, should anything go wrong with the user removal.
Deleting the User:
The user created by the dealer can only be deleted by another Administrator Account. So, as long as this new user you mention is an administrator m-type, then deletion is intended to proceed.
When deleted, you will get a prompt asking you what to save and will ask you whether or not to delete the user’s Home folder. Don’t save any files and select to delete the user’s Home folder. So, the home folder will move to your user, with only your settings.
Only your user will be usable, and your Home folder will remain installed and will pertain only to your user. The other user’s Home folder will be deleted. So, for privacy, deleting it seems wise.
Once All has succeeded create a new Time Machine Backup. You should be fine from there, with only your account remaining intact. You should be fine from there on out.