You'll have to be more precise, I don't know what you mean by "switch".

here is two database tree structure in dadbod-ui, i want to mongo is like mysql, just can switch database in dadbod-ui. but now, mongo database in dadbod-ui is selected when connected to mongod and can't change

my dadbod-ui setting is follow

let g:dbs = [
{"url": "mysql://root:root@localhost:3306", "name": "mysql-local"},
{"url": "mongodb://:@localhost:27017", "name": "mongo-local"}
]

As far as I know Mongo does not have schemas. You will have to add those as separate entries.
I didn't do much for mongo integration, I'm not using it on daily basis. If you think it can be improved feel free to submit a PR.

oh ~, i see, thank you for your answer.