For reference I use it on the Xiaomi Pad 8.
I mostly draw landscape mode, but I made sure it works vertically, too.
Definitely personalize it to your taste, and let me know if I can make it better!
I'll update as I work. I tried to show all of the important tabs for me, but some are hidden because I don't use them. (If you want me to point them out on the pictures lmk)
(Landscape/Horizontal mode)

(More tools)
(Portrait mode) (Vertically)