Missing option "When Homey turn On/Off"

I wanted to set a flow that all lights will turn off after period of time, when Homey goes off and then on.
But found out, that I am missing any option to use Homey in “WHEN” section.
I am sure, that this was possible in past, but looks like this option has disappeared.
Using Homey Pro 2023. Thanks for your response in advance.

Enable Experiments → Power user;
Now you should find a When “Homey has started” card in the “System” category.