Do you want to configure your iOS Lock Screen to block those picking up your device from reading messages, viewing the Today View or interacting with Siri.
It may appear that securing our devices with Touch ID and Face ID is all we need to protect our data. However, there’s other data accessible on the Lock Screen that can still be read by potential data thieves or on-lookers that can gain valuable information.
Lets explore how to secure the Lock Screen so that your messages and push notifications aren’t visible to anyone except you when you pick up your device. We’ll do this by disabling push notification, Siri and the Today View when the device is locked.
By doing the above, you will make your device more secure and prevent onlookers, or someone picking up your device, from gaining access to your private information contained on the Lock Screen.
This is for the iPhone and iPad running iOS 13+. Screenshots are for iPhone

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Disable Notification and the Today View
Open the Settings app. Next, select Face ID & Passcode. Enter your Passcode to proceed. Then, scroll down till you see the section ALLOW ACCESS WHEN LOCKED. Now, toggle off all options except for Siri. We will handle Siri in the Disable Siri section below. Just ignore the USB Accessories option. You will be toggling off 7 options. Refer to below for before toggling off image:

Refer to below for after toggling off image:

Unchecking items in this section will make them unavailable from the Lock Screen when the user is not authenticated by Passcode, Touch ID or Face ID.
There is an alternative feature if you are using a Face ID device.
Open the Settings app. Next, select Face ID & Passcode. Enter your Passcode to proceed. Scroll down to the ATTENTION section. Now, toggle on Attention Aware Features. See below image:

The Attention Aware Features setting is available on iPhone and iPads with Face ID.
When this option is enabled, you will be unable to view notifications on the Lock Screen or Notification Center until the face of the device owner is visible to the Face ID sensor. This feature also provides not dimming the screen when looking directly at it and lowering the volume when the device is picked up.
However, the Today View, will still be visible. You can disable this behavior from the Lock Screen by following instructions in Disable Notifications and the Today View section above.
Disable Siri
If you want to ensure the highest privacy protection, you can disable Siri on the Lock Screen till your device has been authenticated with the Passcode, Touch ID or Face ID.
Open the Settings app. Next, select Siri & Search. Toggle off the Allow Siri When Locked option. See following image:

Now whenever you try to access Siri and any personal requests it allows, you will first need to enter your Passcode, Touch ID or Face ID.
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