To hide the B2C (type 1) orders of a channel from the order report page results, please set the setting 'HIDE_B2C_ORDERS_IN_ORDER_REPORT' to YES for the intended channel.

For Example. To hide B2C orders of channel A.
Set the channel setting 'HIDE_B2C_ORDERS_IN_ORDER_REPORT' to YES for the channel A.

Note - This will only work for WH V9 site.