Where is log out/sign out button on desktop layout

I can help you sign out in the QuickBooks Online (QBO) Desktop app, @haddadpodiatry.

We can go to the File menu to see the Sign Out and Switch Company button if you want to open a different company file.

Here's how:

1. Go to the File menu.
2. Choose either Switch Company or Sign out.

You can check this link about adding attachments in QBO Desktop App and browser: Attachments in QuickBooks Online.

Please let me know if you have other questions about signing out in QuickBooks. I'm always here to help. Take care.