Original Zorin theme borked by me. How to restore it?

As you can see from the below, something isn't right with my theme.
I did install Deepin DE and Plasma to try. Both were glitchy and didn't theme right. So I went back to the OG Zorin theme and I get the below and in other areas around the system.

So, how can I restore this back to actually looking good again?
And a follow up, is there a way of doing a command and reinstalls EVERYTHING (not messing with documents and settings)? Just curious.


For Zorin Core:

sudo apt install --reinstall zorin-os-desktop

Have you gone to Gnome Tweaks or Zorin Appearance and set the default theme there?

I had a look in Gnome Tweaks and Appearance and both were set to Zorin Grey Dark.
Odd, when I run the command you gave, it didn't seem to do anything major.

Reading package lists... Done
Building dependency tree
Reading state information... Done
0 to upgrade, 0 to newly install, 1 reinstalled, 0 to remove and 37 not to upgrade.
Need to get 8,156 B of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 Index of /zorinos/stable/ubuntu focal/main amd64 zorin-os-desktop amd64 1.5.12 [8,156 B]
Fetched 8,156 B in 0s (290 kB/s)
(Reading database ... 466596 files and directories currently installed.)
Preparing to unpack .../zorin-os-desktop_1.5.12_amd64.deb ...
Unpacking zorin-os-desktop (1.5.12) over (1.5.12) ...
Setting up zorin-os-desktop (1.5.12) ...

Then it just ends.

It installed.
Hmmm... Launch Synaptic (Install if you need: sudo apt install synaptic)
Then search for any Plasma Packages. Mark any Plasma Desktop packages for Complete Removal. Repeat for Deepin.
Then click apply.
Reboot and test.

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This is a common issue that occurs after you install plasma desktop.
Open gnome-tweaks and try switching themes and back again. If that does not work then you will need to reset the gnome-tweaks settings to default which works 100% (most) of the time. However, you will need to reconfigure the tweaks app again, if you follow the latter method.

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Thank you. Just tried that now. Resetting didn't fix my theme issues unfortunately.

I've also used Synaptic to remove all Plasma and Deepin items.

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It may be the leftover Oxygen theme and integration. Can you search in Synaptic for Oxygen packages?

sudo apt remove gtk2-engines-oxygen gtk3-engines-oxygen oxygen-cursor-theme oxygen-icon-theme plasma-theme-oxygen

You code shows me this:

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gtk3-engines-oxygen

I found an icon pack for Oxygen in Synaptic, which I removed. I reset tweaks again and logged out, and in. Still the same as the image above.

How about Breeze?