The wrong proportions of the picture

Seems it's not about Themler. You can try to remove width and height attributes in your WP article or set it properly for responsive (for example: width: 100%; height: auto;).

Or add CSS class to image:

img {
    max-width: 100%;
    height: auto;
}

The pictures were successful.
And is there a solution for the other side I've done in Themler - It's about YT movies. On the smartphone in an upright position are not all visible. Only when I reverse the smartphone, the film is visible all the time.
What do I have to do to make the film visible all the way - horizontally and vertically?

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Interesting discussion on visual proportions! It reminds me how crucial proper scaling is, especially for Digital Billboards used in advertising. A small error in image proportion can really affect how content is viewed on large screens. These billboards require precision and high-quality visuals to make an impact. Always great to see people focusing on the details!

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