Could someone tell me what the diamond-shape buttons on the right side of the OpenFX>ResolveFX control panels are there for:

They turn red when selected. I thought maybe to turn off or lock (as appropriate) individual parameter settings, but they appear to do nothing, and there is no hover-over tool-tip.
Can't see any mention in the 14.3 Manual or 15 Beta New Features Guide either.
Resolve 15 Beta Free, by the way.
Thanks.