larchitect Mhm, I see that and this is again some weird Rhino 8 behavior, If you undock RN from the side, so RN panel will be in a floating window editing will work perfectly... What else I can say, again nonsense fixes have to be done...
[EDIT]: I'm waiting for McNeel response about that as the issue is indeed weird, in general, as a floating window its ok, when docked and dock is hidden (new small button on the bottom) - it will also work ok.
BEWARE! For some reason (unknown still) leaving the RN panel opened in the dock and closing R8 will pin RN to reopen when R8 is launched again and it hangs the entire Rhino. If this happens go to the installation folder and rename Rhino Nature.rhp - adding one letter for eg. - run R8 and close it and rename RN rhp back to the original. This is another weird issue with R8 new UI. Rhino 8 struggles to load RN panel at startup for unknown reasons as after startup and opening panel it works as expected.