Setting QT5 apps to use GTK theme in Zorin OS

Tutorials & Guides
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Updated to be accurate to current Zorin OS:
In terminal, download the qt5 plugins and qt5ct configuration tool:

sudo apt install qt5ct qt5-style-plugins

Once installed, you will need to change some things in Root:

sudo -i

nautilus

or

thunar

Or...

nemo

navigate to /etc/profile.d

Open qt-style-override.sh and remove the line there, blanking the file. Save and close.
next, open `qt-qpa-platformtheme.sh and change its contents to:

export QT_QPA_PLATFORMTHEME=qt5ct

Close out the Elevated File manager.
Open the app menu and launch qt5ct
You can select any of the built in themes or use your system theme by selecting gtk in each drop down menu near the top.

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