The Samsung Galaxy Z Flip 3 has a foldable touch screen, which unlike the normal smartphones, is made from an Ultra-Thin glass.
This UTG, although much more durable than what was found in the original Z Flip, is still a bit fragile and for this reason, the Z Flip 3 comes with a screen protector installed on it already. While setting up the phone, Samsung clearly warns the users from removing the factory installed screen protector in order to ensure protection from falls and scratches.
If you are one of those who think that the company installed protector does not warrant enough protection, then you can purchase protectors for the main screen. These protectors are not from Samsung, as they claim the factory installed screen protector to be enough for daily use.