Why does Calendar show a white background even after I enabled Dark Mode for the whole phone?

The app defaults to Light theme unless you set it manually inside its own settings menu. Enabling system Dark Mode alone does not change this app-level preference.

Does switching Calendar to Dark theme really save battery?

On OLED screens, a dark background uses less power per pixel, so Dark theme can reduce battery drain slightly during regular calendar use.

Can I make Calendar follow the phone system theme automatically instead of choosing manually?

The theme option inside Tap on Settings ➔ Tap on General ➔ Tap on Theme only offers Light or Dark, so you need to select the theme manually each time you want to switch.

I changed the theme but Calendar still looks the same. What should I check next?

Force-close the Calendar app and reopen it after changing the theme setting. If it still does not apply, check for a pending app update, since older versions sometimes ignore the saved theme preference.

Oppo

Oppo: Switch Calendar App Between Dark and Light Theme

If Calendar keeps showing a bright white background even after you switch the whole phone to Dark Mode, the app is not following the system setting. Google Calendar on Oppo phones uses its own theme switch, separate from Coloros. This mismatch is common right after a software update or a fresh app install.

Updated: 04.08.20265 min6 steps

VersionAndroid 11 · Coloros 11

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Android 11 · Coloros 11

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Oppo

Set Dark or Light Theme for the Calendar App auf Oppo

Google Calendar does not always follow the system-wide Dark Mode on Oppo phones running Coloros. The app has its own theme control, so a bright interface can persist even after you switch the phone display to dark.

This happens because Calendar treats appearance as an app-level preference, not a system-inherited setting. Older app versions or a recent update can reset this preference back to Light, independent of your Coloros display settings.

To change it, open Tap on Calendar ➔ Open the Menu ➔ Tap on Settings ➔ Tap on General ➔ Tap on Theme ➔ Choose Light or Dark.

Dark theme lowers screen brightness on OLED panels, which reduces battery drain and makes the calendar easier to read in low light. Light theme stays better for outdoor use in bright daylight, where contrast matters more than power saving.

If Calendar still ignores your choice after following these steps, force-close the app and reopen it. A cached display setting occasionally blocks the new theme from applying immediately.

Frequently asked questions

No. Calendar has its own theme setting under Tap on Calendar ➔ Open the Menu ➔ Tap on Settings ➔ Tap on General ➔ Tap on Theme, independent from the system-wide Dark Mode toggle.

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Oppo: Switch Calendar App Between Dark and Light Theme

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Set Dark or Light Theme for the Calendar App auf Oppo

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