Group bar in Horizontal
 

When I use the group bar in horizontal all my hotbars are unuseable, can't click anything. Its works alright in Vertical.

That likely means that you have the group window at the same vertical height as the hotbars and it is (invisibly) extending across them. I'm still going to make a change to this though and have the group window automatically change size so there is no invisible part, I actually just forgot to add that when I redid it.

ya I've just notice it was the group window covering my hotbars lol. When its in vertical mode, you cant see size of the group window.

Agh, this is really annoying as well.

How do you switch it between vertical and horizontal?

I answered this in your other post where you asked the same question, but here you go again, just to make sure.

Per the update notes:

The new "frame only" mode sets the window to vertical mode
The new "none" mode sets the window to horizontal mode
(You may need to toggle the modes back on forth once or twice the first time)