World Preview, 360 view, Quest-ready (PreviewCube)

I have tested some shaders before and ran into issues with custom shaders not working or in the case of this problem having geometry be visible while inside an inverted sphere with a skybox shader. So I guess you could build something similar with a panorama picture and skyboxshader if you place it outside the cameras far clip plane.
The cubemap looks just as good as the panorama, you need to make sure it is reasonably large though so that moving your head left and right wont start distorting things.

@Maebbie shaders work fine in worlds on Quest, just not on avatars. So I take it this is literally just a large cube with a texture on it, which doesnt look as good as a cubemap

Xyunya

Using a custom shader will not work on the Quest and by using the skybox/cubemap shader you run into issues with the Render Queue since you cannot manually overide it in VRChat. You were able to see the geometry through the box with the skybox you were in. This solution is very simple and likely futureproof as well.

You could also just cut a cubemap in half and import it as panorama screenshot, then put it on any Noe/Moe shader (such as skybox/cubemap)

You could also just cut a panorama screenshot in half and import it as cubemap, then put it on any skybox/cubemap shader (such as Noenoe).