I think the observed behavior (in terms of the method that @Tesujitarian suggests) may be unintended behavior (but let’s call it a feature rather than a bug).
I was able to reproduce the steps to get the grid (but not the star points and coordinates) to disappear on Chrome, Firefox and Brave, but it seems that the specific steps need to be clarified:
- Select the customized board option:
- Click on the reset grid color button:
Notes:
- You do not need to upload a custom image to get this to work.
- Just clicking on the reset grid color button does not seem to work, if you instead have a preset board theme selected (i.e., there is no “blue box” indicating that you have selected the customized board option).
Here’s a fun background image to use for 19x19 with no coordinates:
