When I've created slideshows in previous versions of Lightroom, any video I have included (with my photos) has shown in full screen during playback.
In Lightroom Classic CC, the photos show as full screen but the video shrinks to a small box in the centre of the screen. I've played a slideshow that I created in Lightroom 5 through LR Classic and it does the same thing, yet it was fine in LR5. I've tried saving the video in different formats etc before including it, but nothing seems to fix this. If anyone has any ideas, I'd really appreciate it as this is hugely frustrating! I no longer have access to Lightroom 5, so can't go back to it to render the slideshows. Thanks :-)
We're really sorry for all the hassle. When I play a video files in a slideshow module in Lightroom Classic CC it plays in a small window. You can import videos files in Lightroom but it won't give all the features you get in a video player.
Could you please let us know the exact version of Lightroom you are using now?