Linux can mount a partition that a windows OS might have access to, e.g. an ntfs partition, but in normal circumstances, if ever, it needs to be configured in the first place by user's intervention through, for example, the /etc/fstab file or by configuring and running systemd.mount, or by customised or manual partitioning upon installation. It's through those sort of means that such mounting can be specifically made automatic. That specificity was the sort of thing I took to be inferred by @Brickwizard in post #3.Some distros do automaticly mount your windows partition. To unmount it first make sure no processes are using the mountpoint.
then simply unmount the directory:
If you are using windows pro you can simply run bitlocker on the partition you do not want to see windows by default. I do this and run a script to enter the bitlocker key if I want to access what is on the windows drive. If you are using windows home this will only work if linux is on its own hard drive since windows uses whole disk encryption.I want to make it so that linux doesn't have any access to my windows partitions.