not all fonts visible

I am now using the designer with the Doyle theme in the lightbox. This works a little better on smartphones than the flat. Also, I don't have the responsive problem like with the flat design.

However, I have the problem that not all fonts are displayed. I have a total of 19 fonts. In the desktop view, all fonts are there.

But some are missing in the mobile view. Only 10 fonts are shown. The missing fonts can be found using the search field, but the customer doesn't know which ones are available.
Why is there no scroll bar?

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Anhänger - Hundemarke Biothane - Quadrat | 4 Unique Dogs