Editors and Authors Cannot See Layers Menu or Customizer
Users must have the “manage_options” capability in order to access the options menus and use the WordPress customizer. Editors and Authors do not have access to these areas by default in WordPress.
To change these role permissions, you need a plugin such as Members
This plugin allows you to edit the Editor role to enable manage_options and edit_themes
To learn more about Roles & Capabilities, see the WordPress Codex
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