That works well enough for me too! That abrupt window closing on touching and moving the mouse a bit was driving me mad.
Wait until you try this version. You can actually set your choice of three delay times for opening the Instaview.
Then the Right click on the Instaview gives you a really interesting menu.
Suppose you are checking the image with Insta, and you like it. In that Right click menu is a quick
add to queue. Or... a
quick Full screen for a better look.
Insta V even works from the preview panel screen.
Love it!
Fred