Thumbnail size

Hey guys,

Thanks for the awesome booking extension!
Could you please let me know how can I change the thumbnail sizes?
I searched in the backend, I searched in the view files but I couldn't find where it takes the following values, I mean where you specify in what dimensions the thumbnails should be generated:

1. Main Phone thumbnail - 300x250
2. Other Photes thumbnails - 70x70
3. Room Carousel - 300x250

How can I change the Main Photo size (for example 800x450) but at the same time keep the Room Carousel as it is now (300x250)?
Thank you in advance!