To turn off or reduce the Liquid Glass effect in iOS 26, you can do this:

1. Open the Settings app on your iPhone.
2. Go to Accessibility.
3. Go to Display & Text Size.
4. Enable the toggle for "Reduce Transparency." This will make the translucent Liquid Glass design elements more solid and less see-through.
5. Optionally, enable "Increase Contrast" in the same menu to make edges and outlines more distinct, which also diminishes the Liquid Glass effect.

Additionally, you can change your lock screen customization from "glass" to "solid" to remove the effect from the clock and some other UI elements. If you want to completely remove Liquid Glass beyond these settings, the only other option currently is to downgrade from iOS 26 to an earlier version of iOS, using tools like Tenorshare ReiBoot, but this is more advanced and not typically recommended for most users. In summary, you cannot fully "turn off" Liquid Glass via a simple on/off switch in iOS 26, but you can significantly reduce or disable it visually by using Reduce Transparency and Increase Contrast settings in Accessibility, and by customizing the lock screen look.