Here are some images demonstrating the strange bar behavior. This is on a 7th gen thinkpad and KDE plasma.
After update/upgrade?
Fresh installed?
It work before on other Linux/Win?
Please post
inxi -Fxxxza --no-host
No pics 
Try going into system settings then desktop behavior and adjust the blur setting intensity.
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It’s a new install. The system is up to date. changing the blur doesn’t fix the issue.
Maybe wrong GPU driver/settings but without info no help 
Failed to get session path: No session ‘1’ known
Do you get any output for inxi?
Edit: How about: echo $XDG_SESSION_TYPE
System: Kernel: 5.4.10-arch1-1 x86_64 bits: 64 compiler: gcc v: 9.2.0
parameters: BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=3bee4aea-6fb9-4ab8-92e6-0e3d0fe51394 rw quiet
resume=UUID=55c63e1e-4d11-414e-a6d1-5f92a615274c loglevel=3
Desktop: KDE Plasma 5.17.5 tk: Qt 5.14.0 wm: kwin_x11 dm: SDDM Distro: EndeavourOS
Machine: Type: Laptop System: LENOVO product: 20R1000RUS v: ThinkPad X1 Carbon 7th serial: <filter> Chassis: type: 10
serial: <filter>
Mobo: LENOVO model: 20R1000RUS v: SDK0J40697 WIN serial: <filter> UEFI: LENOVO v: N2QET17W (1.11 ) date: 11/27/2019
Battery: ID-1: BAT0 charge: 43.8 Wh condition: 51.0/51.0 Wh (100%) volts: 16.3/15.4 model: LGC 02DL004 type: Li-poly
serial: <filter> status: Discharging cycles: 11
CPU: Topology: Quad Core model: Intel Core i7-10510U bits: 64 type: MT MCP arch: Kaby Lake family: 6 model-id: 8E (142)
stepping: C (12) microcode: CA L2 cache: 8192 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 36812
Speed: 800 MHz min/max: 400/4900 MHz Core speeds (MHz): 1: 800 2: 800 3: 797 4: 796 5: 800 6: 800 7: 800 8: 787
Vulnerabilities: Type: itlb_multihit status: KVM: Split huge pages
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl and seccomp
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Enhanced IBRS, IBPB: conditional, RSB filling
Type: tsx_async_abort status: Not affected
Graphics: Device-1: Intel UHD Graphics vendor: Lenovo driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:9b41
Display: x11 server: X.Org 1.20.6 driver: intel unloaded: fbdev,modesetting,vesa compositor: kwin_x11
resolution: 1920x1080~60Hz
Message: Unable to show advanced data. Required tool glxinfo missing.
Audio: Device-1: Intel vendor: Lenovo driver: snd_hda_intel v: kernel bus ID: 00:1f.3 chip ID: 8086:02c8
Sound Server: ALSA v: k5.4.10-arch1-1
Network: Device-1: Intel Wireless-AC 9462 driver: iwlwifi v: kernel port: 2000 bus ID: 00:14.3 chip ID: 8086:02f0
IF: wlan0 state: up mac: <filter>
Device-2: Intel Ethernet I219-V vendor: Lenovo driver: N/A port: efa0 bus ID: 00:1f.6 chip ID: 8086:0d4f
Drives: Local Storage: total: 238.47 GiB used: 51.69 GiB (21.7%)
ID-1: /dev/nvme0n1 vendor: Samsung model: MZVLB256HBHQ-000L7 size: 238.47 GiB block size: physical: 512 B
logical: 512 B speed: 31.6 Gb/s lanes: 4 serial: <filter> rev: 4M2QEXH7 scheme: GPT
Partition: ID-1: / raw size: 221.33 GiB size: 216.86 GiB (97.98%) used: 51.63 GiB (23.8%) fs: ext4 dev: /dev/nvme0n1p2
ID-2: swap-1 size: 16.84 GiB used: 57.2 MiB (0.3%) fs: swap swappiness: 60 (default) cache pressure: 100 (default)
dev: /dev/nvme0n1p3
Sensors: System Temperatures: cpu: 57.0 C mobo: N/A
Fan Speeds (RPM): cpu: 0
Info: Processes: 302 Uptime: 19h 56m Memory: 15.31 GiB used: 3.79 GiB (24.8%) Init: systemd v: 244 Compilers: gcc: 9.2.0
clang: 9.0.1 Shell: bash v: 5.0.11 running in: konsole inxi: 3.0.37
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Its x11.
My neofetch is
##### kaz@euler
####### ---------
##O#O## OS: EndeavourOS Linux x86_64
####### Host: 20R1000RUS ThinkPad X1 Carbon 7th
########### Kernel: 5.4.10-arch1-1
############# Uptime: 19 hours, 59 mins
############### Packages: 1023 (pacman)
################ Shell: bash 5.0.11
################# Resolution: 1920x1080
##################### DE: Plasma
##################### WM: KWin
################# Theme: Breeze [GTK2/3]
Icons: breeze [GTK2/3]
Terminal: konsole
CPU: Intel i7-10510U (8) @ 4.900GHz
GPU: Intel UHD Graphics
Memory: 3976MiB / 15678MiB
Is xf86-video-intel driver installed?
No it wasn’t, so I installed it, which caused this madness. <https://drive.google.com/file/d/1wIINqbdXK460FWYXUGB1WDLUo6cujeCd/view?usp=sharing> My tty’s still work, but everything else is broken.
I just asked if it was installed? You didn’t answer back. Did you uninstall it from the TTY?
Yes. The computer is now back to normal.
When you say normal? You still have the issue with the strange bar behavior?
Yes, that hasn’t been fixed. I tried installing latte dock to see if the problem is unique to the to the default dock. This didn’t fix it.
So this is afresh install of Plasma. Have you made any changes to the settings? Installed a bunch of programs? Was it like this right from the start after installing?
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The problem was present when there were no programs or updates installed; when it was completely fresh. Since then, I have installed programs, and customized KDE, but the problem has persisted.
Have you tried going into settings, display & monitor and turn off composting?
(Enable compositor on startup) -turn off to test
You can try that and see. Not sure of you have to restart or just log out and in. If it doesn’t change anything just put setting back.
Hm, I restarted my compositor with a different version of opengl, and the problem went away.
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