Hi Liena 

If you can see it in full screen mode, are you sure it simply isn't a problem of screen visibility in scaled mode? What happens when you move around the window so you can see the bottom frame of it?

If this isn't the issue, I suggest you do a RESET of Studio, according to the instructions here:
Resetting Trados Studio to default state (sdl.com)

Walter

Hi Walter,

thanks a lot for your reply. 

I don't think screen visibility is the issue – when I move the window up, I just get a bigger editing window and still no bottom bar. Also the bottom end of the side scroller is not accessible. The issue appeared suddenly after I opened one particular project package and since then affects all projects I work with.

I was trying to reset Studio according to instructions in your link, but couldn't manage to do it: when I get to App Data > Roaming > SDL, there are only 4 folders:

and no ProjectApi folder which I am supposed to rename. Under "SDL Trados Studio" there are 2 folders ("16" and "Studio16") and a VersionManager file. I am not sure how to proceed further...

Hi Liena 

Your screenshot shows the 'SDL Trados Studio' folder and this is the one mentioned in the instructions. 
However, you do not need to rename the entire folder. 
Open the folder 'SDL Trados Studio', then 'Studio 16' and delete all the files of filetype XML (BaseSettings, plugincache and UserSettings).

Once you have done this, relaunch Studio and see if this solved your problem.

Walter

I deleted those files and it did solve the problem indeed, everything looks fine again! Thanks a lot for your help! :)