Okular has an odd choice of font and background colors in some places and this makes it difficult to read some text.
I looked at the settings and searched online but couldn't find anything on changing this.
What can I do?
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You need to change the theme for Qt apps.
This can be achieved in two ways, with
kvantum (don't use both of them together).
Install Kvantum with
sudo apt install qt5-style-kvantum
Now make KVantum as the default theme manager for Qt apps.
echo "export QT_STYLE_OVERRIDE=kvantum" >> ~/.profile
Install qt5ct with
sudo apt install qt5ct
Now make qt5ct the default theme manager for Qt apps.
echo "export export QT_QPA_PLATFORMTHEME="qt5ct"" >> ~/.profile