No control over Lock Screen timeout.

Win 11 22H2 Build 22621.1485
As background: When installing my NUC, I copied software from the preceding system onto the new one (bad choice). My current problem is being unable to vary the timeout for showing Lock Screen. I suspect there is some aspect of the earlier Win 10 program present. At startup the new lock screen shows properly. When I click to enter my PIN, the screen changes to an older interface, still asking for my PIN. When I enter the PIN, the system opens properly. After about 15 minutes, whatever I'm doing, the "new" Lock Screen pops up. Entering the PIN shows the "old" screen interface, but continues to work properly and then time out in 15 minutes.
I've used all the timing controls for Lock Screen and Power that I can locate but they have no effect on how long before the screen times out. Is there some way I can remove the "old" Lock Screen controls and images without destroying the "new" version?