In every module, you will find the option Numeration starting from to set the starting ID for the order numbers of your shop.
The first order will be created with the indicated ID, increasing the following orders sequentially.
Here you can find an example.
As you can see in the image, the ID of the highlighted order is “1”, on the contrary of the previous orders that were following the classic numeration of WooCommerce. Therefore, the ID of the next order will be “2”.
Note: for each new order, the ID value will increase progressively and so the “Numeration starting from” option will be updated with it.
By the way, this value can be modified freely: the order numeration will start immediately from the new value.