In the Weblium editor, there is now an option to change the image ratio in the Flex block and the ratio of images with absolute positioning in ordinary blocks. For example, you can make the image narrower or wider and change its height. It will allow you to form a rectangle that will contain the image. After that, by using a separate button, you can set up which part of the image will appear in a rectangle. At the same time, you can activate the “Scale to fit” switch in image settings to return to the image editing mode with the ratio maintained.
Also, by holding the Shift button in the “Scale to fill” mode (when the “Scale to fit” tumbler is disabled), you will be able to change the image size keeping its aspect ratio.