Realme
Change App Icon Style on Home Screen auf Realme
Realme UI applies one icon mask to every app on the home screen by default, which is why third-party apps with square or custom logos still show up as circles. That mask is a system-wide setting, not something each app controls individually.
To change it, open Settings ➔ Personalizations ➔ Icon styles. Here you get several presets, including a Material look and a Pebble shape, both of which apply the same outline to all icons at once.
For more control, tap Custom instead of a preset. This unlocks Art+, which lets you assign a unique icon design per app rather than forcing one shape on everything. Tap Set the App icon style to open that per-app picker.
Once you have picked the icons you want, tap on a Free area on the icon style screen to exit and apply the changes immediately. No reboot is needed, and the home screen updates icon by icon.
If some apps still look circular after switching, they are usually pinned as system shortcuts or widgets, which do not always follow the Icon styles setting. Removing and re-adding those specific icons after the style change usually fixes it.