How to Turn Off Dark Mode on Twitter
Where the display setting lives on web, iOS and Android, and why the app sometimes ignores it and follows your phone schedule instead.
Web display panel
On the desktop browser version of Open X, in a left sidebar, click on More → Display. The Exterior panel that slides open includes a Background row with three options, Default, Dim, and Lights out. Default is the light theme. Click Default and poof within a second white background fills up the timeline, notifications and messages. There is no save button. Font size and accent colour sit in the same window. The setting here is tied to this particular browser, and firing up a different computer or private window will begin fresh.
Selecting Default does not change the page back to a light colour The browser extension is applying dark colours Dark Reader and similar tools override the site by covering it in a screen that hides the white background. Switch the extension off for x.com and refresh the tab Ctrl and F5 in Windows or Command Shift R on a Mac performs a hard refresh that reloads the stylesheet. Signing out is unnecessary. The Display option is persisted in local storage for this profile. Someone else using the same computer and a different profile in their browser will see whatever theme they chose last time.
iPhone display controls
On iPhone, open X and tap your profile picture in the top left The side menu opens. Tap Settings and privacy. Tap Accessibility, display and languages. Tap Display. You now see Dark mode. If the switch is on, tap it to switch off. As soon as it reaches the App background, it is white. Light mode is applied to posts, tab bar and the composer. If you also see Use device settings and the toggle is on, turn it off first. Otherwise, the app will respect the Dark mode switch and follow the phone.
Copying the iPhone look like makes use of device settings in X. In light mode of iOS, the app is light. When iOS is on dark mode at night the app goes into dark mode irrespective if Dark mode is off in X; Switch Use device settings off → Toggle Dark mode OFF. If you need a white timeline fixed, leave both off. We stay with this phone as a choice. Setting is not copied to install X on second iPhone Your posts and audience are unaffected. Do this in that order.
Android display controls
For Android tap your profile photo on the top of the X app. In the Settings and privacy menu, select Accessibility, display and languages then Display. Locate the Dark mode toggle and disable it The timeline is white all at once. Android also lists a control to respect the system theme. If that option is enabled, disable it first or the app toggles back to dark. Your build can then read the labels as Use device settings or something similar. This path is exactly the same idea but other labels comparing to iPhone.
When you disable Dark mode now, exit the X app and load it again to ensure that the white theme stuck. Others, like some Android skins, impose their own night overlay on top of all elective applications. If your X screen is still black, then go into the phone Settings, search for Dark theme or Night mode and toggle this system setting off while you test. He also noted that Samsung, Pixel, and OnePlus each have put that toggle in a slightly different Display menu. Thus, X is a setting local to this device. Skip that: Clearing app cache resets the theme.
Device settings override
The switch for Use device settings within X is the first override. The Dark mode switch from the same screen is not doing anything useful when it is on. X copies the phone or tablet appearance and reads it. You can go to Dark mode ten times and it will remain light, but the moment the system goes dark, so does the app. Go back to the X Display screen and make sure Use device settings is unchecked. This is when the Dark mode switch actually hard locks your app to light. This is true both on iPhone and Android.
Tablets follow the same menus. On iPad open your profile picture, then Settings and privacy, Accessibility, display and languages, Display. Disable Use device settings and Dark mode. The path is similar to phones, even for androids tablets. Setting X on foldable means that the app setting for the cover screen and the inner screen is synchronized so you only have to change it once. Tablet browsersWeb still More then Display no mobile path The app and mobile site each have their own Background choice so the mix here can look inconsistent.
Operating system schedule
Second override is the phone schedule which makes entire system dark at a scheduled hour. For iPhone: go into the iOS Settings app, not X, and Tap Display and Brightness When Automatic is enabled, iOS will automatically change to dark at sunset or the scheduled times. You will have that clock followed by X with Use device settings on. If you want the phone itself always light, turn Automatic off and switch Appearance to Light. After, go to the X Display screen and turn off both switches for a static shade theme.
On Android head to Settings > Display. Look for Dark theme. Open it and check Schedule. None, sunset to sunrise or a custom window are your options. If you want the system light then Set Schedule as none,Turn \Dark theme off. When Use device settings is on, X still respects that state. Once you disable the schedule, open up X > Display > turn Use device settings off. The two layers are independent. One fix leaves the other free to turn the timeline inside out at night. Do a hybrid or the White Theme dies in one night.
Dim and Lights out themes
X ships three backgrounds. Default: A white one that you want for light mode. On Dim a dark navy background accompanies his dark grey cards. The contrast is softer which seems to make it easier to read in a normal lighted room than say pure black screen. Lights out is true black. On an OLED phone actually black turns off the pixels and saves battery. On LCD Lights out appears nothing more than a very dark grey and it saves no data. Both themes do not actually change anything relating to your tweets and who can see them.
Appearance is stored locally. Your choice for the web sits in browser storage. The choice of app lives in the app data on that device. Your laptop's UI switch from Lights out to Default know what touch the phone. Turning on the phone does nothing to the laptop. You are able to have different themes on every device. Web display panel accent colour and font size remain the same. You wont find any of these controls in your account settings and they never appear in your data download. You select Default on any screen that you want to remain white.