When attempting to produce a report in Base, the report page went to very nearly full screen size, but could not be resized, i.e. only the ‘Close’ button top right and the borders of the document could not be grabbed to resize. Subsequently, when opening a new Writer document, it appears exactly how the report did (very nearly full screen size) and with exactly the same issues. A Calc, Draw, Math or Impress document open up as normal.
Seems to me as though the problem is caused within Base (I presume a Base report is a Writer document).
The above is with LO version 5.4.2.2 (on Linux (Sparkylinux based on Debian) 4.13.0-1), though is very nearly the same (the 3 buttons top right are present) in LO version 5.1.6.2 (on Linux 4.4.0-98 (Xubuntu))
Opening an existing Writer doc shows the same problem. Strangely, a PDF doc opens normally (in LibreOffice Writer)!