I have a problem with /kits on my serwer.
I opened a file "default_kits" and deleted kits "enderchest" and "tools", but they are still on server.
How to delete them?

File default_kits.json does nothing on server it's only used for single player worlds. To edit kits on server edit file kits.json in maessentials catalog.

Where is this catalog?
Because I can't find it :/

The problem is that in file ma-essencial I have only "default-kits". There is no file "kits.json"

I need to create this file myself?

I found it in different way, thanks!