Funny enough it's not hard to point out how to view 2d space time 1D space 1D time. it would simple be a dynamically coloured line which transition's up along a 2d plane. So you could view it as a 2d picture.
3D spacetime 2 geometric dimensions and 1 time dimension or 1 geometric dimension and 2 time dimensions can be view as a 2d picture changing across time in our 4d space we could not view this spacetime in a single picture in a single point in time.
If we lived in 5D space time 4 geometric dimensions and 1 dimension of time you could view 3d spacetime completely as a 3d hyper surface where you can see the full 3d body on a surface and it would help a lot in properly mapping time to video data and game data.
We could possibly do analytics in the future modelling off the shadow imprinted by a 3d hyper surface as to improve our understanding of 3d spacetime and maybe even 4d or 5d spacetime even spacetime's which have more than one time dimension.