If you click on HOME in your project the Back Arrow is available.
If you now go to Tools and click on “Project Dependencies Mass Update Tool” the Back Arrow is removed.
That’s a huge bug because you cannot get back to the project. Instead you need to reopen the project.
Studio 2019.10.1 - 11/11/2019
License Provider: Orchestrator
Update Channel: Stable
Microsoft Windows 10 Enterprise 64-bit
.NET Framework Version 4.7.2 or later