I share the detailed steps to set the size of symbols in the surface finish of a drawing:

1. Click the "Annotation" tab in the command manager.
2. Select the "Surface Finish" option.
3. In the Property Manager, look for the "Format" section.
4. Deselect the "Use document font" option.
5. Click on the enabled “Font…” option.
6. In the "Choose Font" window, look for the "Height" section.
7. Modify the "Units" value according