Samsung
Restore Default Theme auf Samsung
A downloaded theme changes more than wallpaper on a Samsung phone. It swaps icon packs, lock screen style, and even keyboard colors through the Theme Store, which runs independently from the regular Settings menu. Deleting the theme file from storage does not reset these elements, because the Theme Store keeps the applied theme active until you switch it manually.
To bring back the original Samsung look, open the Theme Store directly instead of digging through display settings. The stock appearance is stored as its own entry inside the app, right next to any themes you have downloaded.
Go to Tap on Settings ➔ Tap on Themes ➔ Open the Menu ➔ Tap on My stuff ➔ Choose Default ➔ Tap on Apply. This applies the original Samsung One UI theme across the home screen, lock screen, and icons in a single step.
If only the wallpaper changed and icons still match the default set, a simple wallpaper reset from the gallery is faster than a full theme reset. Use the steps above when icon shapes, app drawer background, or edge panel colors still show the downloaded theme.
After applying the default theme, a third-party launcher may still override icon shapes. Reset the launcher settings separately if that happens.