Hello,
You need enable sidebar in Theme Options > Shop > “Enable sidebar on “My Account” page” > On.
Concerning the Wishlist page you need create your menu and add “Custom Menu” widget to Main Sidebar or create your own https://www.8theme.com/demo/docs/legenda/index.html#!/custom_widget_areas . Then select your sidebar in Wishlist page editor in Page Layout box.
Thank you.
Regards,
Eva Kemp.