MuseScore window resizing itself on Linux
I work in MuseScore 3 on a relatively low-resolution laptop screen (1280x800) and often like to do a split-screen between MuseScore and a public-domain page scan that I am transcribing from. I am able to resize the window to the size I desire, but as soon as I go into note entry mode and start entering notes, the window resizes itself to be larger (often repeatedly) for no obvious reason. The only workaround I have found is to drag the window half off the left side of the screen and move the part of the music I am working on to the right side of the window.
Has anyone else seen this problem, or is it unique to my system?
OS: Ubuntu 18.04.4 LTS, Arch.: i386, MuseScore version (32-bit): 3.2.3+dfsg1-4~ppa1804+1 (Ubuntu bionic/i386), MuseScore build number not set, revision: d2d863f
Desktop: Xfce 4.12, distributed by Xubuntu
This machine has been upgraded gradually from Ubuntu 9.04 all the way to Ubuntu 18.04 and has some artifacts of its prior life including broken QT developer tools from when I tried to compile MuseScore 3 from source without upgrading Ubuntu. Once I upgraded, I was able to cleanly install a prebuilt binary package, but these system oddities could help explain what I'm seeing if it's not normal.