macOS Big Sur window headings font

Hello Zappo750,

We see you'd like to know if you can increase the font in the heading of your Mail app.

At this time, there isn't an option to change this feature.

If you'd like to leave feedback about this, you can do so here: Product Feedback - Apple

We hope this helps.

Thanks for using Apple Communities. Have a good one.

Hello Zappo750,

We see you'd like to know if you can increase the font in the heading of your Mail app.

At this time, there isn't an option to change this feature.

If you'd like to leave feedback about this, you can do so here: Product Feedback - Apple

We hope this helps.

Thanks for using Apple Communities. Have a good one.

Appllication title bar fonts and font size are baked in when the application is built by the developer. This is not a user changeable feature.