I need some help regarding the image sizes generated by the Soledad theme.

It appears that the theme generates about 9 different image sizes:

- penci-full-thumb - 1170x0
- penci-slider-thumb - 1170x663
- penci-magazine-slider - 780x516
- penci-slider-full-thumb - 1920x800
- penci-thumb - 585x390
- penci-masonry-thumb - 585x99999
- penci-thumb-square - 585x585
- penci-thumb-vertical - 480x650
- penci-thumb-small - 263x175

I don't want the theme to do this anymore, is there a way to turn it off?