[feature] Lack of expanding/collapsing in menu tree

Is this a BUG REPORT or FEATURE REQUEST?:

feature

What happened:
The menu list is very long.

What you expected to happen:
lack of the expand/collapse function in menu tree view.

How to reproduce it (as minimally and precisely as possible):
debug the whole project and visite the http://:port/zh

Anything else we need to know?:

Environment:
N/A

I guess we may close this issue.
@freesky-edward what do you think about that?
or I am misundering this feature.
show or hide the menu tree?

@xiangxinyong sure please, thank you for the enhancenment

/priority medium

/kind feature

/close

this issue is closed by: @freesky-edward.

openEuler / docs