Ryan Christoffel, 9to5mac.com:

[I]n iOS 26.4, there’s another new setting that lets you disable a different aspect of Liquid Glass. 

It’s called ‘Reduce Bright Effects,’ and it controls the bright flashing response that shows up when interacting with certain UI elements.

Nice! I’ve found those bright highlights very distracting since September. I’ll be giving this new option a whirl.