XFCE desktop will boot, but the screen resolution is off, and the fonts are hardly readable. LXQt desktop will not boot, the machine drops into a terminal during boot.

For both szenarios it is necessary to first install the AMD Display Drivers. Use your favorite text editor to open /etc/apt/sources.list.

• Modify each line to add the contrib and non-free repositories.

  deb http://deb.debian.org/debian/ buster main non-free contrib
  deb-src http://deb.debian.org/debian/ buster main non-free contrib
  deb http://security.debian.org/debian-security buster/updates main contrib non-free
  deb-src http://security.debian.org/debian-security buster/updates main contrib non-free

• Save and exit. Then, update Apt.
• Install the AMD Drivers

  sudo apt install firmware-linux firmware-linux-nonfree libdrm-amdgpu1 xserver-xorg-video-amdgpu

see How to Install the Latest AMD Drivers on Debian 10 Buster and Binary firmware for AMD/ATI graphics chips

sudo apt-get remove --purge libreoffice*
sudo apt-get clean
sudo apt-get autoremove