I see new issue. When I select preview font, I can set "font style", like regular, italic, bold, normal, oblique, etc. This information is not saved to ReText.conf file; only font name and size is stored. It means that once Retext is started in the future, it can show different style in preview mode (and in PDF export). It is also possible to select font effects, like strike or underline but these are not saved to ReText.conf.
I see new issue. When I select preview font, I can set "font style", like regular, italic, bold, normal, oblique, etc. This information is not saved to ReText.conf file; only font name and size is stored. It means that once Retext is started in the future, it can show different style in preview mode (and in PDF export). It is also possible to select font effects, like strike or underline but these are not saved to ReText.conf.