Ok now that my 10 plus has updated (today) to Android 10 I now see the option to turn off "show charging information" .
NOTE..... You have to be on Android 10 OS to see this option. So until you've updated your phone to Android 10, you will not see this option!
I found the right solution by trting the screensaver one mentioned in this thread. I've done this on an S10E, but I hope it's the same on all devices of this generation.
Go to Settings > Display, and scroll down. The two options on the very bottom are Screen Saver and Show charging information, simply toggle Show charging information to off.