Tiled Mosaic thumb size

I deactivated jetpack and now is serving scaled thumbs, is it possible to solve this without deactivating jetpack? (obviously when jetpack is turned on, I turned off the tiled galleries module, but nothing is changing)

I’m using this plugin instead of the jetpack module just because of the size of the images… ?? but I’d like to not to lose some of the benefit of running jetpack on my website.

Thanks