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When using Eevee, an object with a glass material (in this case: Principled BSDF, trasmission set to 1.0) doesn't seem like it can be looked through: it's completely opaque.

See for instance the material for the blue cube in this scene:

enter image description here

How can I get my glass material to be transparent?

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By default, some options that require extra computing efforts are turned off in Eevee and they must be turned on manually.

In the case of a refractive object, you must enable:

  • Under the Render settings, Screen Space Reflections and, within it, Refraction. manual.

    enter image description here

  • Then, in each of your refractive materials' Material settings, you should enable Screen Space Refraction. manual.

    enter image description here

If your material has some kind of Alpha transparency (e.g. a Transparent BSDF shader), you should also select a suitable Blend Mode. manual.

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    $\begingroup$ Thanks for sharing, it's pretty well hidden :). $\endgroup$ – Jachym Michal Jan 6 at 13:40

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