Set image sizes

Default Image Sizes:

For better UI result you need set default image size as given in image.Dashboard -> Settings -> Media

default-image-sizes

rtMedia Image Sizes:

For better look on activity timeline you need change default image sizes from rtMedia settings.Dashboard -> rtMedia -> Settings -> Image Sizes

rtmedia-image-sizes

WooCommerce Product Image Sizes:

Set product image sizes as per given in bellow image.Dashboard -> WooCommerce -> Settings -> Products

product-img-sizes