The current documentation for the local configuration of the White Switch (White Series 2-1 Switch • Button Combinations, Quick Tap Sequences & Local Configuration Options | Inovelli Help Center) says
Hold down on the configuration button until the LED Bar turns Yellow and let go - the LED Bar should then flash Cyan which indicates it was saved successfully
The confusing thing here, though, is that the LED Bar turns yellow (briefly), then green and then yellow again. And one needs to wait for that second yellow phase to release the button to save the parameters. Would be great if the documentation could be updated to reflect that, took me quite a while to figure that out.