How to set min and max large thumbnails eg. 1024 or only 192 pixel?

How to set specific pixel for thumbnails?
Can you only set the previews when they are displayed in grid mode from the browser and disable the previews when they are in list mode?

What difference is there between FILE_PREVIEW_MAX_SIZE, THUMBNAIL_SIZE_FOR_ORIGINAL and THUMBNAIL_IMAGE_SIZE_LIMIT?

https://download.seafile.com/published/seafile-manual/home.md