[PyMOL] map symmetry expansion on 1.7.2.1

Hello,
PHENIX has calculated a *_refine_001_mFo-DFc.ccp4 map for me, which I
“meshed” with isomesh mesh, map, 3. I understand map_auto_expand_sym is
enabled by default. Yet when I translate using the middle mouse button, I
can easily go beyond the extent of the mesh. How can I make the mesh fellow
the canvas center? Do I need a different map?
Thank you,
Wolfram Tempel
​