The sequential order number is a default feature of the WooCommerce Multistore plugin that you can enable or disable. When enabling the feature for the first time, the plugin calculates the highest order number across your stores and sets the next order number in the sequence.
If for any reason you want to change the sequential order number, please install this plugin.
How does the plugin work?
After the installation, look for the sub-menu Change Sequential Order Number under the network admin WooCommerce menu. Current Sequential Order Number will show you the number currently set. If it’s set to Not Set, then the sequential order number has not been set yet.
If you want to set it to any number, change the value Update Sequential Order Number To and press Save Changes.
If you want to unset the number and thus being the counter from the next highest order number across your store, enter 0 and Save Changes.
Screenshot of the settings