Can Dirichlet B.C. affect the eigenvalues?

Hi everyone

I'm dealing with an eigenvalue problem that is supposed to study the effect of the Boundary condition on the eigenvalues.
Apparently, in an Eigenvalue study in COMSOL, any prescribed values of the dependent variable (no matter the magnitude) are taken to be zero.
Anyone has any idea if there is any trick to affect the eigenvalues through the Dirichlet Boundary conditions?

Thank you