By default the “scale to fit” text option is enabled. You can find this option in the property panel under the “Text” tab. Every text element will automatically scale its font size according to the boundaries set by its container and the minimum and maximum font size values. It is a very useful setting if you need to work with multiple languages, for example.
This means that if the text doesn’t fit in its container, the font size decreases with a minimum size as set up in the properties. On the other hand, the font size will automatically increase if there’s room left in the container and the font size is smaller than the maximum font size value.
If you'd like to always keep your text elements in one unique line, for example, ensure that the container is more wide than high as you can see in the image below:
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