When adding a KNX Secure device, ETS asks you to set a project password.
I think ETS should first ask you if you want to use the device with standard KNX communication or with KNX Secure communication.
If you select KNX Secure communication, you can ask to set a project password and ask to add the device certificate.
Now the 'Cancel' button is not clear.
It should be 'Do not set project password' or 'Use without KNX Secure'.
A lot of users think it's to cancel the import.