Grove - OLED Yellow&Blue Display 0.96(SSD1315) - How to manipulate the colors?

I am using a Arduino MKR WiFi 1010 with a MKR Connector Carrier connected via the 12C connector to the SSD1315. I have got the ‘Hello World’ sample running okay using the U8g2 library. I note that the first row of text is yellow and the following rows are blue. How do I manipulate the colors? The library reference states that it is for monochrome displays. There is a setDrawColor method, which does not appear to have any effect.



For most of those small OLED displays, the colours are hard-coded: first top line in orange, other lines in blue. The software considers the display as monochrome.