You can use the ui "dots". Near the bottom left of the standard ui you will see a small square with 9 dots. It will say ui.

Set your ui to the way you like it then click on one of the dots and it will fill up. When you next start poser click on this dot and the ui will revert to the version you set.

I usually click on the first dot with the ui in default settings, so I can easily get back to this if I mess things up, and click on the 2nd to save my preferred setting