Android
Change the Default Launcher App auf Android
When you install a new launcher, Android does not automatically load it after setup. The system keeps a stored preference for the Home app and only updates it once you actively confirm the change.
This preference lives in the Default apps section of the system settings, separate from general app permissions. If this step is skipped, the Home button and app drawer keep pointing to the previous launcher, even if the new one appears installed and fully configured.
To switch, open Settings ➔ Apps ➔ Default apps ➔ Home app and select the launcher you want to use as the Default home app. The change applies immediately, and pressing the Home button reloads the new interface right away.
Switching launchers usually resets widget placement and app shortcuts, since each launcher stores its own layout data. Icons, folders, and grid settings from the old launcher generally do not carry over. If a launcher is missing from the list, reinstall it or check that it has not been disabled under App info.