3D FlipBook - Set length & width

1. https://www.youtube.com/watch?v=1SbHrjTZATg
2. add CSS class fb3d-activate-fullscreen or use another lightbox theme "Dark Glass Shadow"
3. add style:

   .wrap #primary {
   width: 100%;
   }
   

I am using the free version. I added the css : fb3d-activate-fullscreen and the result is: https://managementresearch.co.in/june-flip-book/

I added .wrap #primary { width: 100%; } to Custom CSS, but due to it, the side widgets, on other pages did not show properly. (I have disabled the Sidebar widgets on the Flip book post )

I also tried Thumbnail with Lightbox. The thumbnail size is not changing. I want to increase the size of the thumbnail. I also increased the Thumbnail size in Settings-Media, but no change

use this style

.wrap #primary {
width: 100%;
}

only for pages with disabled side bar.

what plugin version do you use? did you update the flipbooks after changing Settings-Media?

Problem sorted out. The cache was creating issue.

Thanks a lot

One small query: Is it possible to open the flipbook in a new window, when clicked on the Thumbnail (thumbnail and lightbox effect)

No

https://managementresearch.co.in/april-june-2020/ I have selected Lightbox only (no thumbnail). Still it is not showing in fullscreen. The shortcode is: [3d-flip-book mode="fullscreen" id="3226" classes="fb3d-activate-fullscreen"][/3d-flip-book]

as i told you before - the problem lies in your theme, you need to fix style sheet for pages with disabled sidebar.