Welcome - one more thing to understand (coming from being brand new about 30 days ago, so I had to learn everything like you’re doing right now) is that some tasks are done with the built in SmartThings app and somethings are done with apps that are “add-on’s” to the SmartThing App. So for what you’re trying to do, there is SmartHome Monitor, which is the first button in the Android app on the bottom left. It will do what you need. But there are other “apps” that can accomplish this too and usually, they have more flexibility and options.
For example, when i started, I used the built in ST (SmartThings) “Routines” (called Automations) to control my lights. But I quickly found that it didn’t give me the options I needed so I installed an add-on app call SmartLighting, which is still part of ST but an add on. It has way more control. As JD suggest, read the FAQs and if you’re still lost, reach out to the community here. I’ve found them to be extremely helpful.