Hi Lane,
The thumbnails don't have an off setting available as a theme options but you can use a bit of css. Try adding the following CSS to your Quick CSS (located under the Styling Tab in the theme options) or the custom.css file in the css folder of your theme files:
#top.home .thumbnails_container_wrap.container_wrap {
display: none;
}
For the height of the slider, its a bit harder as its set automatically to adjust to the height based on the screen size. You can use something like this as well but it will force the effect all the way down to mobile and it doesn't look good at that point. So a secondary media query has to be added to remove the fixed height on most mobile sizes:
#top.home .slideshow_container ul {
height: 250px !important;
}
/* All Mobile Sizes (devices and browser) */
@media only screen and (max-width: 767px) {
#top.home .slideshow_container ul {
height: auto !important;
}
}
Regards,
Devin