Windows boot manager not showing in the bios boot menu.

[Dus.Tin]

My PC had preintsalled Windows 10(UEFI).Last month,I installed some linux operating systems in my pc(Legacy).So,I know that windows won't show on the grub boot menu.To start windows,I should go to the boot menu and select the "windows boot manager".Yesterday,I installed another linux OS in a partition sda7(I think ,The partition has no connection with the windows 10).After that,Windows boot manager option is not visible in the boot menu.But there is Hard disk option.(The Hard disk option leads to the Grub menu).Now I can't boot into the windows.I checked the partitions in linux OS.Everything i

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