The current behavior of hover preview is for the preview window to disappear as soon as the mouse cursor has moved from atop the link.
It would be nice for Obsidian to allow the preview window to remain if the mouse cursor moves towards and on top of the preview window itself; and for the links within the preview to be clickable.
Yes, I was also hoping that the preview can become a pane:
This is also related to Nested Popovers
wanted to open the same feature request, then saw yours. I also would love to be able to move with my mouse into the preview window and to click on links there