Hi dacflyer, I'm sorry you are having some issues there.
1 - I just did a quick look on my monitor and saw that the window requires at least 1210 x 360 pixels to be shown fully. If there is anything less than that, you would have to drag it around to see the other part of the screen. There are no scroll bars embedded into the window, but you should be able to grab the ends and stretch them around. I don't know why that wouldn't be working for you, but I'll make note of it.
2 - Setting the HOLD and FADE works the same way you would set the color. Use the drop-down menu under the color controls to set the value, then click and drag to paint that value into each of the slots as needed.
3 - There isn't currently an on-the-fly adjustment for the colors that results in a live display of the color change. The easiest way to approximate this would be to click the number for that memory slot at the top, then shift+click the desired LED box, adjust the sliders, then click the "Apply Main Color To Selected Slots". There is much that I would like to see rewritten about the color selection, live adjustments and a more accurate representation is on my wishlist.
"Those who say it can't be done should get out of the way of those who are doing it."