Email, Messaging, & Video Calls Email How to Change the Yahoo Mail Interface Color Customize the interface for Yahoo Mail and the Yahoo Mail app by Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated on November 22, 2019 Email Yahoo! Mail Gmail Tweet Share Email Although Yahoo Mail offers limited customization options, it is possible to change the theme and color of the interface. You can also alter the appearance of Yahoo Mail by adjusting how messages are displayed. Instructions in this article apply to the standard web version of Yahoo Mail and the Yahoo Mail mobile app for iOS and Android. How to Change the Yahoo Mail Interface Color Changing the color of the left navigation bar and other interface elements is a straightforward process. Select the gear in the upper-right corner of Yahoo Mail. Select a Theme from the drop-down menu to automatically change the interface appearance. Select Light, Medium, or Dark. Scroll down the drop-down menu to adjust the Message Layout and Inbox Spacing. Click outside of the drop-down menu to resume using Yahoo Mail. How to Change the Yahoo Mail App Interface Color The Yahoo Mail app offers fewer options, but it's still possible to change the interface colors. Tap the Menu icon in the upper-left corner of the Yahoo Mail app. Tap Settings. Scroll down and tap Themes. Tap the squares at the bottom of the screen to change the interface colors. Tap Set theme in the upper-left corner to confirm.