Strange boot up screen 2019 MacBook Pro
It sounds like your Mac is starting up in 'Verbose Mode'.

This shouldn't normally happen, unless you hold down the required key combination, or unless your Mac's NVRAM has been set to always start verbose. 

Try resetting the PRAM to clear the boot arguments.

If that doesn't work, try the following Terminal command:

sudo nvram boot-args=""


(Assuming you don't have a need for any other custom nvram parameters.)