Open the Liquid Glass app/settings.
Go to the device’s display or screen effects menu.
Select “Liquid Glass” (or “Liquid Glass Mode”).
Toggle it off.
If there’s a “Quick Settings” tile, open Quick Settings and turn off Liquid Glass there.
If it’s controlled by a launcher/theme, open the theme/launcher settings and disable the Liquid Glass effect.
If it’s a system accessibility or overlay feature, open Settings → Accessibility/Installed Apps → Special access/Display over other apps and disable Liquid Glass.
Restart the device after disabling, if the effect remains.