Can I better control the size/position of the closed caption display box in V10?

I recently upgraded to Adobe Captivate 2017 by default; I was sent a new work computer with V10 installed. In version 9 I was able to display a full CC box across the bottom of the slide from side to side without worrying about it covering over my table of contents. In V10, it seems I'm very limited to the size and placement of the box based on the x, y, w and h settings. If I set the x% so the text box does not cover over my tables of contents, then I can't extend the width of it to cover the entire screen shot. This makes the CC text box look like a mistake, or an afterthought, since it appears to be 'randomly' placed on the screen.