i already created the usersdb but it does not show

mongo

MongoDB shell version v3.6.19
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
Implicit session: session { “id” : UUID(“9bea0d75-362b-4f55-ac5d-6c709d2ddb36”) }
MongoDB server version: 3.6.19
Server has startup warnings:
2024-05-03T16:48:49.803+0000 I STORAGE [initandlisten]
2024-05-03T16:48:49.803+0000 I STORAGE [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2024-05-03T16:48:49.803+0000 I STORAGE [initandlisten] ** See http://dochub.mongodb.org/core/prodnotes-filesystem
2024-05-03T16:50:31.149+0000 I CONTROL [initandlisten]
2024-05-03T16:50:31.149+0000 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2024-05-03T16:50:31.149+0000 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2024-05-03T16:50:31.149+0000 I CONTROL [initandlisten]
2024-05-03T16:50:31.150+0000 I CONTROL [initandlisten]
2024-05-03T16:50:31.150+0000 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always’.
2024-05-03T16:50:31.150+0000 I CONTROL [initandlisten] ** We suggest setting it to ‘never’
2024-05-03T16:50:31.150+0000 I CONTROL [initandlisten]

show dbs
admin 0.000GB
config 0.000GB
local 0.000GB
use userdb
switched to db userdb
show collections
db.users.find()