Columns inside a text frame

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https://sebastianwinkler.net/text/
Columns inside a text frame

In the desktop layout I have two separate text frames. When I stack the elements on top for the mobile layout I want one textbox. If I do so and select only apply to current layout, the desktop layout changes as well.

Main question:
Is it possible to have two columns inside one text frame? It would fix the problem, that I don't need two separate text frames at all.

Best,
Leon