CorrectNameCasing is switched on by default. This to correct the names in a lot of databases which are just caps with '_'.
If you switch it off (in the preferences so next project will inherit that setting) and in the project settings (so it will be effective for this project) and you add a new entity, the names are not corrected.
The names are corrected according to the MS library guidelines. I know these change as much as the wind changes direction, but it's a start
. In the next designer upgrade, more name settings are planned, as well as a corrector for current elements in a project.