I don’t want the images at 300×300 px

I would like to be able to change the size of the Woocommerce product images. It is by default 300 x 300px. I wish it had a format where the width was limited to 200px and the height was automatic. I have already tried running the function in css, but it does not work.

Please, what should I do to make Shop Elite “see” the new format for the images displayed on Home?

I will wait for a return.