Dual screen window size problem

Certain programs don't seem to co-operate well with a dual monitor setup. If it is of any importance, my setup is a laptop with a TV plugged in via HDMI. So far I've found that VLC media player and Oracle Virtualbox won't play nicely with two monitors. When both monitors are in use, virtualbox crashes before it can open, and vlc tends to freeze the entire system, requiring a hard reboot. If I run these programs while only one monitor is being used and plug in the second one, they'll start misbehaving if moved to the other monitor. virtualbox and vlc will both become way too huge to be usable.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 5.4.0-47.51~18.04.1-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 22 12:02:21 2020
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company HD Graphics 620 [103c:8364]
InstallationDate: Installed on 2020-02-21 (214 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
MachineType: HP HP Pavilion Laptop 15-cc0xx
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-47-generic root=UUID=da68f1b9-ec5f-4962-8098-08f28713396e ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/03/2017
dmi.bios.vendor: Insyde
dmi.bios.version: F.13
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 8364
dmi.board.vendor: HP
dmi.board.version: 46.23
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.13:bd11/03/2017:svnHP:pnHPPavilionLaptop15-cc0xx:pvrType1ProductConfigId:rvnHP:rn8364:rvr46.23:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Pavilion
dmi.product.name: HP Pavilion Laptop 15-cc0xx
dmi.product.sku: 1KU17UA#ABA
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2~18.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.8-0ubuntu1~18.04.1
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A