Explanation:

Box 1: Modify the Bootstrap.ini file.
Add this to your bootstrap.ini file and then update the deployment share and use the new boot media created in that process:
SkipBDDWelcome=YES
Box 2: Modify the CustomSettings.ini file.
SkipBDDWelcome
Indicates whether the Welcome to Windows Deployment wizard page is skipped.
For this property to function properly it must be configured in both CustomSettings.ini and BootStrap.ini.
BootStrap.ini is processed before a deployment share (which contains CustomSettings.ini) has been selected.
Box 3: Update the deployment share.
Reference: https://docs.microsoft.com/en-us/mem/configmgr/mdt/toolkit-reference#table-6-deployment- wizard-pages