How can I get full text notifications in standby (sleep) mode on the Galaxy S9+?

[Android Central Question]

My Galaxy S7 edge allowed me to get text notifications while in sleep mode. My S9 tells me I have a text message but I have to wake it up to view who sent it. Also, Is there any way to keep the notification on the lock screen longer? I can see it come up but I'm not fast enough to catch it. My S7 notifications would stay on until I accessed them. Any help would be appreciated.