Would you like to try playing like in this image, but with star points still present to aid navigation?
I don’t know if it’s re-creatable for others, but I can explain the steps I did myself, if there’s anyone interested in trying it out themselves 
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I definitely feel like keeping the coords around the edge defeats the point entirely 
turn those bad boys off my dude
(Keeping the star points is a nice touch though)
Teach us, sensei
Just press “reset colour button” on the right near grid colour selection box once.
As far as I understand, it’s enough to add a custom goban image with transparent parts(or maybe any image(I have no way to test it now once I have no grid)). OGS can’t handle the image and instead it shows your picked colour without the grid, but with star points.
Like in this image for example:
https://imgur.com/a/E6IcRzJ
Disclaimer: there’s no known way to revert the changes once you do it.
Because of posts like this, which seek to assert oneself at someone else’s expense instead of marveling together, I have no desire to interact with this forum.
Why is it at your expense?
IMO Someone took the time to show you an easier way to do what you did, which helps you and possible others interested.
Pardon? I’m still waiting for the tutorial steps. 
go to customize stones and boards window(window that pops up when you hover over your profile pic in the upper right corner);
press “more options” button at the bottom;
you will be sent to appropriate settings tab;
go to the “Board theme” → choose Customize Board → copy and paste this link https://imgur.com/a/E6IcRzJ to the “paste link to the image” field.
Voila! you now have previously unattainable no grid experience, while you have star points enabled as well as coordinates(if you have coordinates turned on).
Fun fact: If you use image with a transparent background it trashes your custom board option, so you have no grid even if you remove the link. Oops!
Or maybe custom boards didn’t work from the beginning and images with transparent background have nothing to do with it 
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Have you tried applying the replacement board image that you want?
This works for me: I clicked on one of those blue ones to be very clear, and I got a blue background.
I guess this might be browser-dependent. When I try to do this (or use other transparent images), the board seems to have no issue and displays the grid.
This method, of changing the board background colour and the grid line colour to be the same does work to hide the lines.
But it has the drawback of only allowing for a single color, and not an image (e.g. with wood textures). Also, the star points disappear as well.
So I present the ultimate way to hide the grid (but with star points!):
Injecting the following javascript ought to work:
setInterval(function(){
var style = document.createElement( 'style' );
style.innerHTML = 'g path { display: none; } g text { display:none; }';
if (document.getElementsByClassName('Goban')[1].shadowRoot.lastChild.tagName != "STYLE") {
document.getElementsByClassName('Goban')[1].shadowRoot.appendChild( style );
}
},100);
If you want to hide the star points as well, you change the third line to:
style.innerHTML = 'g:nth-child(2) { display: none; } g text { display: none; }';
When I was messing around with this I found that it’s not really obvious when the selections that you click actually apply - I suspect this is the caused of this sort of reported problem.
There isn’t an “apply” button … and the intuition that if I delete this link then the custom image will be removed is wrong.
You can tell what’s being applied if you know how though: the board on the same screen further below is instant feedback on that.
In my mind this is all “if you’re mad enough to want custom stuff you can darn well figure out the interface - it was hard enough to make it work at all, let alone make it all intuitive” 
What do you mean by “one of those blue ones”? If you mean one of basic 12 board themes, then if I choose them everything works alright. If I go back to custom - no lines.
It might be indeed browser-dependent. I tries doing the same on my phone and grid appears, it just ignores my image link basically.
…
OH lol, I think I just figured it out. While trying out it again on my phone I had one last theory to try. When I initially did that image(that a posted a link to) I pressed reset grid colour. I tried it on my phone and grid just disappeared!
You’re right. It doesn’t work because I was wrong it appears. The theory I now have is that you just need to reset your grid colour button on the right to the “colour select” rectangle. It resets it to black and then it works, grid disappears, but star points stay. Unfortunately, if you change colour it goes back to normal.
