I’m pretty sure power/cadence used to be displayed during the warmup in the pen before events but it seems like this has gone missing in a recent update (maybe the new desert update?)
That display was very useful during the warmup not least because you could check that everything was working properly.
Here is an example 6 seconds (13:46 into the video, you need to watch the video to see as the preview screenshot doesn’t show it) before the start of the recent Bologne time trial event:
And here is an example of what it used to be like: