It seems that it is only possible to change the radius of a rectangle by using the handles in a newly drawn or pasted rectangular shape but it is not possible to adjust the radius of a frame. There are also no way in the right panel to enter a specific value.
Use case: I am pasting a mobile design from a Figma Design file into Figma Slides and want to round the corner of the frame and that is not possible.
Figma Slides: Radius control
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