Kolleno reads your invoices, customers and payments from a single Business Central environment. You choose that environment when you connect, by typing its name into the Environment name field.
There is no setting to edit it afterwards. To read from a different environment, disconnect Business Central and connect it again with the new name.
Signs you are connected to the wrong environment
Kolleno imports nothing at all, imports far fewer customers or invoices than you expect, or imports data you recognise as test data rather than your live ledger.
Change the environment
In Kolleno, go to Settings, then Accounting.
On the Business Central integration, select the ellipsis, then Disconnect.
Select Connect on Business Central again.
In Environment name, type the environment you want Kolleno to read from. The field is filled in with the environment you last connected with, so it will still show the old name until you change it.
Select Connect, then sign in to Microsoft when prompted.
The name has to match Business Central exactly, including capital letters. Most companies have an environment called Production and an environment Sandbox.
Check the extension is installed there too
The Kolleno extension is installed per environment in Business Central, so an extension installed in one environment does not apply to another. If the environment you are switching to has never been connected to Kolleno, install the extension there before you reconnect.
Not sure which name to use
Your environment name appears in your Business Central address bar and in the Business Central admin centre. Both are covered in Find your Business Central environment name.