Changing the database of metabase dashboard

I have a dashboard that is connected for example to a database x. I want to change tiles in a dashboard to connect to database y instead of x? is that possible? if it, then how?

If you change the connection details for the database, all the questions for that database will be changed.
There's no way to change individual questions.

Ohh i thought maybe there is a way to do thhat, good to know that there is. not. Regarding the database change for the entire dashbaord, from where can i do that? i read from one or more source that it can be done from the UI but i can't seem to locate the correct part, where i can change it.

In admin, just change the connection details of the database.
Select 'Databases' from the top menu, then select the database you want to change.
Important thing is to never delete a database!

Even more important - backup first.
Even, even more important - don't use H2 (Postgres is best)