How to "Fix mesh" in ZbrusCore?

Hi! I’m working in ZbrusCore, when I try to activate the Dynamic Subdivision a message pops telling me that “the mesh contains 4 edges that are shared by more than 2 polygons, ‘Fix Mesh’ and try again” but I can’t find a way to Fix the mesh since the “MeshIntegrity” tab is nowhere to be found.
Is there a way to fix the mesh?