Whenever you save a login through the browser extension BitWarden does not offer you to save it to a folder or organization/collection. This is a must as most users want to quickly save a password and move on with their workflow. They will not bother to spend time logging in the bitwarden webpanel, search for the login they just saved, then select and move it to a folder or share it with an organization/collection.
I have used many other password managers, and I cannot remember a single popular one that does not have this option. Adding all logins to the root folder(No Folder) is just bad practice. Especially in an environment where 99% of the passwords need to be shared within an organization.