Reproduction steps:
1. Open new AR or VR Template Unity Project
2. Observe Editor Menu
3. In top-right corner of the Editor, press the "Layout" dropdown and select "Default"
4. Observe Editor Menu
5. In Editor Menu, select Tutorials -> Show Tutorials
6. Observe Editor Menu

Expected result: The Editor Menu does not disappear throughout the process
Actual result: The Editor Menu disappears on project creation and after pressing "Show Tutorials"

Reproducible with: 2021.2.0a1, 2021.2.0b10, 2022.1.0a7
Not reproducible with: 2019.4.30f1, 2020.3.18f1, 2021.1.20f1

Notes:
1. Using the "Layout" -> "Default" dropdown on the top-right corner of the menu brings the Editor menu back
2. After workaround 1), Window -> Layout options are disabled on 2021.2.0b10
3. Issue doesn't reproduce on Windows 10