Editing Multiple Masters
Font masters are listed in the Layers palette. Click the / buttons to show a layer even if it is not currently active. See Layers for details.
/
buttons to show a layer even if it is not currently active.
See Select All Layers Tool
Use the Select All Layers tool (shortcut Shift-V) to edit the paths of all visible layers at the same time. Click the / buttons in the Layers palette to show or hide layers. Switch between the Select and Select All Layers tool by clicking and holding the Select icon, then choose the desired tool from the menu:
(shortcut Shift-V) to edit the paths of all visible layers at the same time.
Click the 
icon, then choose the desired tool from the menu:
Show All Masters
When in Edit View, choose Edit → Show All Masters to add all master layers of the current glyph to the Edit View tab. This command also inserts Intermediate and Alternate layers.
Keep Layer Selection in Sync
Select the Edit → Keep Layer Selection in Sync option to keep the current selection when changing masters. This option only works when working on a compatible glyph.