It can be turned on under the menu in View\Windows. (The first place I would look in all programs for window related stuff - for a View menu).
When using the slide out windows at the side, do not hit the X in the corner as this closes the window, instead use the drawing pin to pin it out and then unpin
it to allow it to slide back.
What problems are you having, TBH I think that this may just be because you are not familiar with how CADSTAR works.
It is an extremely flexible software that allows you to get exactly the results you need when you need them, you can do an awful lot as long as you are prepared to
setup the system to achieve it in the first place. For every 10 mins you put into setting things up to should get hours of saved time back.
As for using ORCAD, well thats a dead duck and EasyPC... chalk and cheese.
If you have other problems then just ask away, or ring up the support chappies who have arranged the trial period for you.
BTW, are you using the full version or the Express version?
P.S> there are at least 2 other ways of adding parts. Menu - Add and also using the library searcher.