@VectorStyler
I sent the data by email.
Sorry for the confusion. By "losing control," I meant that the frame resizes in an unintended way.
Here is what happens:
When I double-click the bottom-right handle, it fits both horizontally and vertically at the same time, changing the text frame size completely.
For example, if I want to fit the frame vertically while maintaining the exact width of 100mm, only the bottom-center handle works correctly as expected. Double-clicking any other handle alters the width, which is not the desired result.