As the title says, really. Is there a tag or expression to check whether the watch is ambient mode or not?
Welcome to the Community Daniel, where you’ll find loads to learn and lots of helpful people too. As for your question: not quite sure what you’re meaning there. Watches automatically switch to Dim Mode after a few seconds if AOD is set to on. There are no Tags for it as far as I’m aware, but when creating Faces you can edit both the Active and Dim displays.
The tag for ambient mode is #ZLP# and you can test for it using a text element with $#ZLP#==false?Off:On$ in the Text box. Just make sure you turn on ambient mode for viewing the text element since it’s off by defalt.