In the FormLetter "Design" module, every time you import a SVG file, the software will automatically generate the 3D model based on the current settings.
You can freely change any design option before and after importing the SVG file.
Every time you change a design option, the "Generate 3D Model" button will turn green. It means the button is active for clicking to preview the letter of the updated settings.
Here is an operation demonstration ↓