.....so you can set a custom page to be loaded when you open a new tab.
How do you do that? That's what I'm asking?
I also would like to see it a little more up in the page when speed dial is disabled.
A little more up? For me on a maximized window it appears in the bottom 10% of the screen leaving a huge blank spot
Speed Dials aren't automatically populated, you need to manually add them. So you will only see there what you want.
I'm not sure how yours behaves but on a fresh install for me, my top visited websites are in speed dial. Usually they're fairly benign but occasionally there's something embarrassing or private there.
I can right click and say "don't show this" but I'd rather not take any chances and have something embarrassing unexpectedly show up. Say for example my most visited website is a job search website, and that pops up in when I'm screensharing with my boss. Oops!