What you're showing is the dialog box for creating a single environment setting. You need to create a day cycle and import it, or you can create individual settings from the day cycle editors. You will see (among other things) a panel like the one in the picture below, where you can control the time of day your environments will show up. One way to create your first day cycle is to right click on a folder in your inventory (the folded called Settings would be your best place), the select New Settings -> New Day Cycle, change its name to something descriptive, then double click on it.
https://gyazo.com/2c8c79df950af4ba14f5bfae5e145b07
Inara Pey has an excellent tutorial about these things at:
https://modemworld.me/2020/04/21/tutorial-environment-enhancements-project-eep/