I still see the "Activate DxO ViewPoint" dialog in DxO PhotoLab 3 after I activated it. Why?

It probably means that you have only activated the DxO ViewPoint 1 plug-in, which is available for free when upgrading to DxO PhotoLab 3 from DxO OpticsPro v9 or a former version.

We recommend purchasing and activating a DxO ViewPoint 3 plug-in, which offers new features in addition to those offered in DxO ViewPoint 1.