Long ago I was told of looking at a timeline so that time "travels" from left to right is the normal view, but now rotate that timeline so that it appears as a dot to you. You now see all events of the timeline, but without reference to "when" they happened. Lots of scifi plots are also described as such

Think about a maze drawn on a piece of paper. Because we’re in 3D you can see all of the maze at once but if you were a 2D entity inside the maze you would only see the walls / entrances / exits directly in front or behind you. Now imagine drawing a line from the entrance to the exit - that’s 2D + a time dimension. Now make it a 3D maze and an entity existing outside of spacetime would be able to see all events happening at once in 3D.