Steps to reproduce the issue

Articles: Options --> Layout Editing, at the bottom there are class options for images.

Install blog demo data. Go to the "Your Template" article, click EDIT and go to the Images and Links tab.
Pay attention to the image classes and the description of the parameter.

REMARKS

1. The description is not in the parameters of the article component, but is here on the tab and only for the full image. Should I add it for the intro image as well?
2. The default class is left, however the float-start and float-end classes are better styled. See the difference in the frontend. Wouldn't it be better to make float-start the default class? Among other things, we will also get a "match" of the description to the real class in the parameter (say, left is not mentioned here).