HDRI gone missing

If you’re use an orthographic view mode - you better switch to perspective one. Fitting background when using an orthographic view - it’s a difficult thing I might say.

Back in the day, when I was doing my project called farm, I’ve had a problem with fitting backgorund to an orthographic view mode. Tho I ended up solved that problem - it wasn’t that easy. That my project uses background that made by using just nodes when yours is using HDRi, I don’t even sure if it’s possible to make your background to be viewed in that case.

But on the other hand you could try to set perspective camera view to be look closely just like an orthographic one. I don’t know whether it’s hard to do or not, but you could try anyways. However I think it could be possible somehow, instead of trying to solve it with orthographic camera.