How to resize slideshow size?

Hello, good afternoon. I'm new to this whole website creating thing, so i don't know a lot of things. I just created a slideshow gallery on my site, the original pictures are supposed to be really small squares, 300x300 px squares, but when i upload them to the slideshow gallery, they are huge, and i really don't know how to resize them and make them smaller

Hello! Just wondering if you found a solution to this? I'm having the same problem atm

You can consider adding spacers on either sides of the slideshow block.
From there, adjust the size of the spacers till you get your desired size on screen. I don't know how to adjust it to exactly 300px though. You can check out the video below on how to add spacers.

https://support.squarespace.com/hc/en-us/articles/206566717-Spacer-Blocks