I do not see my work space/document ....

Hello to you,

I'm facing a bit of a stupid problem. I have to work with CorelDraw at my workplace (normally we use InDesign ...) and now I dont know what to do and nobody is able to help me.
I'm from Germany so please excuse my bad english ... I work with an iMac and the CorelDraw 2019 version for mac.

Now my problem:
If I'm opening an old document OR if I'm opening a new document I do not see the document. I'm not sure about the english word for it, I'm not seeing the work space. The white document where I can start doing stuff, you know? (God I feel so stupid right now) ... i went through all the settings but nothing helps. If I'm opening the preview I can see that I did something. We all have no clue why we cant see what we're doing.

I hope you get what I mean and someone can help me out. Thank you very much!