Hey Pratyush,
UID 1 cannot be deleted from the developer portal from the GUI. There are safety measures in place that prevent you from unintentionally deleting this user.
Removing UID 1 is not recommended because this user is the root or "super" user that will always have all permissions. It's always recommended to have this user as a way to enable critical permissions that are not enabled for the administrator role.
If you happen to delete UID 1, you could try recreating it via an SQL query. You can find more information about the query here.
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