I cant see the contents on the side of the indesign page
You mean the pasteboard? Check if you are not in preview mode or presentation mode.
Yes the side pasteboard.
I am in Normal mode. And if I drag something to the side it disappears.
and it is only happening on one file..
Ok I have sorted it.
For some reson the pasteboard options in preferences under guides and pasteboard where set at 0mm 0mm on that one file.
I thought preferences are set for the program not individual files.
Some preferences are document only.