Change thumbnail icon in output
Is it possible to change the icon that RoboHelp uses to mark thumbnail images? This is the icon I see in the output:

But I've been asked if the icon could be made more noticeable on the screen, as the default icon looks like it's grayed out. I can't find the image file that RH uses for this icon, and I don't see any posts here on this subject. Is it possible to do this?
I'm using RoboHelp 2019 Classic with the Indigo layout to produce Responsive HTML output.
