Hello,
It is possible to disable the automatic Invoice creation for Magento Orders created for imported eBay Amazon Orders.
To do so, you should navigate to the Account settings > Orders tab > Order Status Mapping box and untick the corresponding option:
https://prnt.sc/k4txmr https://prnt.sc/k4txzo
https://docs.m2epro.com/display/eBayMagento2/Orders#Orders-OrdersStatusMapping https://docs.m2epro.com/pages/viewpage.action?pageId=19726902#Orders.-OrderStatusMapping
Emiliano