ORD CE 2021 R2 - Change name and feature definition disabled

hi

Using ORD 2021 R2. When I created Terrain Model, neither its feature Definition not Name can be changed via Element Properties or within the Explorer. The only way is to do that via Pop-Up menu/context menu. Same with Linear Features, Meshes, etc. Name and Feature Definitions are faded-out.

is it a bug?

Adam