Make shared disk space: 1 SSD (Windows), 1 partitioned HDD (Ubuntu).

I have a SSD with WIndows 10 installed, and I recently installed Ubuntu on a partitioned HDD.
The HDD is partitioned into two, one with Ubuntu, and the other I want to turn it into storage for both operating systems.

Right now, I can only access it from Windows 10. How can I make it so that I can access it from both operating systems?

Additionally, I currently see the SSD in the Ubuntu Files Explorer ("249 GB Volume"). Is there a way to make it so that I can't see this?

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Make shared disk space: 1 SSD (Windows), 1 partitioned HDD (Ubuntu).