Program window is empty

Thingy just shows an empty program window.

Even though I have opened .pdf and .odt documents they do not appear.

Also: There should be at least a short help text, that describes the purpose of the software & how to use it.

System report: System: Kernel: 5.4.0-96-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Xfce 4.16.0 tk: Gtk 3.24.20 wm: xfwm4 dm: LightDM Distro: Linux Mint 20.3 Una base: Ubuntu 20.04 focal Machine: Type: Laptop System: Hewlett-Packard product: Compaq Presario CQ61 Notebook PC v: Rev 1 serial: Chassis: Quanta type: 10 serial: Mobo: Quanta model: 306A v: 21.0B serial: BIOS: Hewlett-Packard v: F.06 date: 06/03/2009 CPU: Topology: Dual Core model: Pentium T4200 bits: 64 type: MCP arch: Penryn rev: A L2 cache: 1024 KiB flags: lm nx pae sse sse2 sse3 ssse3 bogomips: 7981 Speed: 1931 MHz min/max: 1200/2000 MHz Core speeds (MHz): 1: 1659 2: 1829 Graphics: Device-1: NVIDIA G98M [GeForce G 103M] vendor: Hewlett-Packard driver: nvidia v: 340.108 bus ID: 01:00.0 chip ID: 10de:06ef Display: x11 server: X.Org 1.20.13 driver: nvidia resolution: 1366x768~60Hz OpenGL: renderer: GeForce G 103M/PCIe/SSE2 v: 3.3.0 NVIDIA 340.108 direct render: Yes Audio: Device-1: Intel 82801I HD Audio vendor: Hewlett-Packard driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:293e Device-2: Logitech H600 [Wireless Headset] type: USB driver: hid-generic,snd-usb-audio,usbhid bus ID: 4-2:2 chip ID: 046d:0a29 Sound Server: ALSA v: k5.4.0-96-generic Network: Device-1: Qualcomm Atheros AR242x / AR542x Wireless Network Adapter vendor: Hewlett-Packard driver: ath5k v: kernel port: 4000 bus ID: 02:00.0 chip ID: 168c:001c IF: wlp2s0 state: up mac: Device-2: Realtek RTL810xE PCI Express Fast Ethernet vendor: Hewlett-Packard driver: r8169 v: kernel port: 2000 bus ID: 03:00.0 chip ID: 10ec:8136 IF: enp3s0 state: down mac: Drives: Local Storage: total: 232.89 GiB used: 246.94 GiB (106.0%) ID-1: /dev/sda vendor: Samsung model: HM251JI size: 232.89 GiB speed: 3.0 Gb/s serial: Partition: ID-1: / size: 18.21 GiB used: 12.04 GiB (66.1%) fs: ext4 dev: /dev/sda5 ID-2: /home size: 43.88 GiB used: 38.66 GiB (88.1%) fs: ext4 dev: /dev/sda6 USB: Hub: 1-0:1 info: Full speed (or root) Hub ports: 4 rev: 2.0 chip ID: 1d6b:0002 Hub: 2-0:1 info: Full speed (or root) Hub ports: 8 rev: 2.0 chip ID: 1d6b:0002 Device-1: 2-4:2 info: Quanta HP Webcam type: Video driver: uvcvideo rev: 2.0 chip ID: 0408:03f4 Hub: 3-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 chip ID: 1d6b:0001 Hub: 4-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 chip ID: 1d6b:0001 Device-2: 4-2:2 info: Logitech H600 [Wireless Headset] type: Audio,HID driver: hid-generic,snd-usb-audio,usbhid rev: 2.0 chip ID: 046d:0a29 Hub: 5-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 chip ID: 1d6b:0001 Hub: 6-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 chip ID: 1d6b:0001 Hub: 7-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 chip ID: 1d6b:0001 Hub: 8-0:1 info: Full speed (or root) Hub ports: 2 rev: 1.1 chip ID: 1d6b:0001 Sensors: System Temperatures: cpu: 41.0 C mobo: N/A gpu: nvidia temp: 41 C Fan Speeds (RPM): N/A Repos: No active apt repos in: /etc/apt/sources.list Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 1: deb https: //mirror.init7.net/linuxmint una main upstream import backport 2: deb http: //ubuntu.ethz.ch/ubuntu focal main restricted universe multiverse 3: deb http: //ubuntu.ethz.ch/ubuntu focal-updates main restricted universe multiverse 4: deb http: //ubuntu.ethz.ch/ubuntu focal-backports main restricted universe multiverse 5: deb http: //security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse 6: deb http: //archive.canonical.com/ubuntu/ focal partner Info: Processes: 194 Uptime: 3h 45m Memory: 3.81 GiB used: 2.46 GiB (64.6%) Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Client: Unknown python3.8 client inxi: 3.0.38

linuxmint / thingy

Program window is empty #8