I believe the Ventanas come with the Auto Motion Shades. They should be just like the MCD Shades when it comes to adjustment. To adjust the roller speed and how far they roll up or down, there is a wheel on both sides of the night shade and day shade. Take a look at their web page for adjusting.
Auto-Motion Shade | Support | Technical Manuals
Lastly, if you need to remove them, they're held in by clips at the top. The clip has a rounded front edge that you push on with your finger or better yet, something like a 3/8" wooden dowel, as it's hard to do for most with a finger.
This is the clip at the top of the shades. It's upside down, but the rounded part on the left is where you push top release the shade.