Simply launch Assistant on any screen that isn’t the launcher drag up. You’ll get cards for content found on the screen. It’s similar to Now on Tap, but just calls this screen search now. From there, you can use the contextual cards, or go on making Assistant comms. You can also ask the Assistant contextual info based on what’s on the screen. For example, when reading a website about Hawaii, you could simply summon the Assistant ask “how’s the weather there?” without even swiping up to get those screen search cards. The Assistant should give you the weather in Hawaii.  You can easily disable the things you don’t want, customize news sources, in the Settings. st tap the overflow menu (three dots in the upper right) from the Assistant.