Presumably this is the Lenovo machine mentioned in your other thread ?.
If so, EFI systems can (usually) set the default boot in the firmware menus (what used to called the BIOS screens). Simply change it to your Win10 option. When that works, simply remove the Fedora partitions - leave the EFI partition, Win10 uses it as well; you can delete the Fedora directory.
Note all the above presumes Lenovo follows standard practice - which I realise is a pretty long stetch.
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