Please create a new notebook under the currently active notebook. In this version, the new notebook appears to be created in a random location.
It used to be that when I right-mouse-click on a folder then choose New Folder, that the created folder would appear under the currently active folder.
Joplin 1.0.227 (prod, win32)
Client ID: 348634c19a984fbc80460ee0b23c7d45
Sync Version: 1
Profile Version: 30
Keychain Supported: Yes
Revision: 4913fdb8 (master)