Auto Merge Editing in Workspace option shelf is gone? I just downloaded a new copy of Blender 2.8 and I can't find the Mesh Option Menu that had Auto Merge Editing. Mesh Option Menu seemed to be contained in a shelf that changed with each Workspace.  This shelf was between the Workspace tabs and the Header of the 3D Viewport Editor. It's probably simple......
you can find this options in Active Tool and Workspace settings...


and another option is..
you can right click on any icon on header and in header menu you can find Show Tool Settings