It's definitively a 72x40 pixel display.

Thanks Richard for pointing to all changes (and tips) I can/should make in the code

Now, regarding the way to display data, I still don't get it; I'm completely lost since I have no clue how to do it.

I'm mostly using serial "common" LCDs in text mode so I don't have to create any font or so.

In my case, I will use this LCD to display, as big as possible, a number as a percentage (0.0%...99.9%).

What is the approach? I have a display 72 pixels wide and 40 pixels high (= 2'880 pixels). I assume, the display is divided in what they call "pages" and I should write a data table (LOOKUP) for each page. Is this correct?

But how do I address the pages? Do I have to do so? Is there a way to send "text" to the display like common LCDs? Is there a way to "design" a font that will in big appear all over the entire display?

I'm missing fundamentals 😔