But if i install kde, it installs a lower version that Arch does. How can I install the last version?
You are right...You will only get the max version allowed by the base ubuntu version. I will look into it tomorrow. It is night here.
Here's a guide that should help...
According to the guide, you should get most major updates by backporting, so they may be unstable.
Sorry but I did not test this....Because I don't experiment/test on my Zorin OS system...And the computer where I test, has Ubuntu 21.10 which already gets the latest stable updates for Plasma Desktop.
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I'll test it rn...
Use gnome-tweaks to reset all settings to default.
Unfortunately didn't, it's still broken.
Did you ensure all QT / KDE specific applications were removed using Synaptic and Reboot after resetting in Gnome Tweaks?
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Yes, I've removed all the applications starting with kde* or plasma*. I've also removed any files that contain the word kde in the home folder.
You might check ~/.config/gtk-3.0 and remove anything there that you did not place there.
Or you might just rename ~/.config to .config-bkp. log out and in, and check the themes appearance.
Thanks! Fixed! I just deleted some .gtkrc files and it started showing the theme correctly 
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XFCE Customization guide.
Log out. If you're in lite, there is a bar across the top with a pull down listing the installed de's. On gnome, once you click to enter the password, there is a gear/cog in the bottom right that gives the same list.
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how to get Cinnamon 6 ?
You can use apt list cinnamon-desktop to see the version available in the repo. But you would most likely either have to build it from source or install it from a jammy repo.
Do a web search for how to install cinnamon desktop 6 Ubuntu 22. As Zorin 17 is based on Ubuntu 22.