Why not edit the menu?

WP 4.9.3
Created a topic, WP when you switch to it in settings menu lost the ability to edit attached points.
Here's the default theme:
5cca80ddca7a1896016347.png
Here's mine:
5cca80f74ef1d827172867.png

That is disappeared on the arrow to expand.
I understand that it is necessary to register in functions.php. Just?
March 20th 20 at 11:27
2 answers
March 20th 20 at 11:29
Solution
Is styles broke...
March 20th 20 at 11:31
menu zaregatsya in functions.php?
I'm not a WP developer, I don't know why something to register. Well my menu is called main. I have added this nonsense:
register_nav_menu('main','main');
(it is not clear, where is the General ID menu, specify)

The edit links are still unavailable - Arthur_Hudson99 commented on March 20th 20 at 11:34
@Amaya_Hans, well, now in the admin panel, select your main menu as a main and save - Keshaun.Senger17 commented on March 20th 20 at 11:37

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