I have a PCB with components already in it but I´m not able to open the Layer Definition menu, it shows as non-selectable...
How should I proceed to solve this?
The Layer Definition menu pick can become grayed out in an Integrated Project if your design is out of sync with the schematic (go to Setup > Project Integration to confirm all the lights are green). It can also occur if you have the Constraint Manager window open. Close any open windows for Constraint Manager and see if the selection becomes active again.
Try disabling the design rule checking ("DRO") and try it again. Use "DRW" (warning) or "DRP" (prevent) to reenable the design rule checking.
Thank you all for the information. The project was out of sync.
Onced synced it worked ok
Retrieving data ...