How to set shortcuts for NERDtree

[exaV]

I would like to use l to open/expand nodes in NERDTree instead of (or additionally to) the default key o.
Is that possible? and how would I configure it?

I tried searching online and combining what I found abound configuring plugins with the actions listed here
https://github.com/JetBrains/ideavim/wiki/NERDTree-support in various ways, but to no effect. Typing l always triggers Idea's search.
I tried (none of it worked)

let g:NERDTreeMapActivateNode="l"
:map l <Plug>(NERDTree-g:NERDTreeMapActivateNode)
:map l <Plug>(NERDTree-o)

Also is there a way to use only / to start searching in the project explorer, as opposed to any key that isn't mapped to something in NERDtree?

[allworldg]

Actually , the solution you give is very helpful for me . Thank you .

[captainxyw]

How do you reset default key binding for NERDTree? bro

[allworldg]

@captainxyw I just change Preview :

let g:NERDTreeMapPreview="<Tab>"

[KrtNinja]

set NERDTree

let g:NERDTreeMapActivateNode = 'l'
let g:NERDTreeMapJumpParent = 'h'

After restart IDE, it helps me