I'm having trouble trying to actually start the application. I have cloned the repository and compiled it from source using this guide; which is the simplest to follow for linux noobs like me. But after the installation and reboot, I can't see Kvantum anywhere. It's not in the Qt Style options and searching it from the menu gives nothing. What have I done wrong?
As you have compiled and installed Kvantum, then you can:
specify theme for single application like
or make this permanent
echo "export QT_STYLE_OVERRIDE=kvantum" >> ~/.profile
follow official Theme-Config.pdf guide to set up the theme.