db_0043: Simulink® font and font size
All text elements (block names, block annotations, and signal labels) except free text annotations within a model, must have the same font style and font size. Select font style and font size for legibility.
Note: The selected font should be portable (for example, the Simulink and Stateflow® default font) or convertible between platforms (for example, Arial or Helvetica 12pt).
By Task > Modeling Standards for MAAB > Simulink > Check for difference in font and font sizes
For check details, see Check font formatting.