How to open multiple hotbars?

[monchild]

I've been trying various custom UI's in addition to default, and can't open multiple hotbars. I'm getting really frustrated because I've been researching for hours and keep downloading files people say and nothing seems to work. I've set keybindings to open hotbar 2-4 and still nothing. Thanks in advance for any help, i'm losing my mind.

All I want is to be able to play with 2 horizontal hotbars. I remember a few years ago playing this and never had issues with any UI stuff. Apparently something has changed, maybe with newer patch files?