How to reproduce:
1. Open the attached "1269790 repro" project
2. Open the Project Settings from Editor > Project Settings
3. Select the Device Simulator tab
4. Select the Editor tab

Expected results: no errors are thrown and the Editor tab opens
Actual results: UnauthorizedAccessException error is thrown and the Device Simulator tab remains open

Reproducible with: 1.1.0-preview (2019.4.8f1), 2.2.3-preview (2019.4.8f1, 2020.1.2f1, 2020.2.0a20)
Could not test with: 1.0.0-preview (Device Simulator tab in the Project Settings window isn't present)

Notes:
-The attached projects is an empty project with the Device Simulator package and the "DeviceSimulatorSettings.asset" file set to Read-only
-The issue only reproduces when the "DeviceSimulatorSettings.asset" file is marked as Read-only, this can be done manually or with Version Control
-After the 3rd step has been completed once, the issue reproduces continuously when selecting any tab in the Project Settings