A thought experiment: The rainbow temple

[Jackalope]

Myself, I come down on the side that the universe actually exists.

I see this as a tautology (where universe = all that exists).

Whether our perception is an accurate picture of that reality is a whole different kettle of fish. Or, put another way, the nature of that which exists in reality is not contingent of any agent being able to detect it.

Pretty sure we agree on that.

Even though my reality of it is all I can experience, there is a separate 'thing' called the universe that exists regardless of me and will continue to even if I can perceive it or not. Some people find it uncomfortable to think that the Universe exists without them, but I find it to be a strangely comforting idea that it'll go on without me. That it'll always be there.

That, and I believe that many people find it discomforting to think that their position in the universe is an unimportant one.

There was probably a time when such thoughts might have bothered me, had I bothered to contemplate them. The universe will get along fine without me, or it won't - either way, I have no say in the matter.

To the OP's question - yes, the outside world still exists, but perhaps not as I perceived it.