I've just had the One UI 6l.1 update pushed out top my S21 Ultra and am dismayed to find that the lock screen is now monochrome grey on black. The clock and any notification icons are all just grey. 

Within just a few seconds I am wishing I hadn't installed it, as I can't see anything in settings about this. 

Previously it was very easy to recognise the notifications, eg the green WhatsApp one. Now it's grey. Email notifications all now show the same grey envelope outline instead of the red or blue envelopes that different apps showed before. 

What a mess.