Portacle's default font and color are sometimes uncomfortable, and you can make some settings according to your own preferences.
change font size
Click menu Options->Set Default Font...
A dialog box titled "Font" pops up
After selecting the font and size in the dialog box, click the "OK" button to complete the font size change.
theme color settings
Click menu Options->Custon Emacs->Custom Themes
A list of themes will be listed in the view area of the window, as shown inside the red rectangle in the figure below.
Click “[ ]” with the mouse to complete the theme color setting. As shown below:
