Select thegearin the upper-right corner of Yahoo Mail.
Select aThemefrom the drop-down menu to automatically change the interface appearance.
SelectLight,Medium, orDark.
Scroll down the drop-down menu to adjust theMessage LayoutandInbox Spacing.
Click outside of the drop-down menu to resume using Yahoo Mail.
Tap theMenuicon in the upper-left corner of the Yahoo Mail app.
Scroll down and tapThemes.
Tap the squares at the bottom of the screen to change the interface colors.
TapSet themein the upper-left corner to confirm.