Log in to your account at https://app.mangodisplay.com.

Choose the display you want to edit.

Then select the widget you want to edit.

On the calendar widget settings, click 'Format'.

Under 'Body Format' you'll have the option to edit the widget's font. You can choose to change the font style, color, and size.

And to change the background format, click 'Custom Format' if you want a different background format. The 'default' format is the format that was setup as a the default for all widgets in your display settings.

It will show you options to change the background color, widget background effect, background blur, corners, and shadow.

Select the settings you want, click save and you're done!