To update the shipping address on selected orders associated with an account when the shipping address is changed on the account, the administrator should create a screen flow on the account page that lets the reps choose which orders they want to update with the new address. This will give them more control and flexibility over which orders are affected by the change. An autolaunched flow on either object will not allow reps to select specific orders, and may cause unwanted updates or errors. A screen flow on the order page will not be able to update multiple orders at once. References:
https://help.salesforce.com/s/articleView?id=sf.flow_build_screen.htm&type=5