i made a blog and now i want to fix the issue if somebody doesn't add an image to use as the thumbnail, I want to use a default image. I did find a plugin that fixes that, but i would like to change the featured image on the single post page. So the thumbnail on the blog layout is the square logo and on the single post page is the full width logo i have. Not sure if this is possible to make the single post featured image different than the one on the main blog page.
The square logo shows perfectly in the blog layout, but in the single post page it doesn't look good. So i would like to set different default images or replace the image on the single post page using php, wich i didn't find working code for.
Anybody knows how i can fix this? Thanks