There is a generic problem that we always use 100% width for content types. Especially this goes for images. Two examples are Drag & drop and Column.
Maybe we could support:
Max-width setting for images. Possible options could be "Use all available width", "Size of image decides", "Max-width in pixels"
Max-width setting for content types? Some or all?
One related issue here: https://h5p.org/comment/14787