Search bar flickers sometimes change its size on clicking after enabling Device Simulator Provider while AdaptivePerformanceGeneralSettings is selected.

Steps to repro:
1. Create a new project.
2. Edit > Project Settings > Adaptive Performance > Install.
3. Project > Select AdaptivePerformanceGeneralSettings.
4. Project Settings > Enable Device Simulator Provider.
5. Click on the Search bar.

Actual Result:
Search bar flickers on clicking after enabling Device Simulator Provider.

Expected Result:
The search bar should not flicker or change its size.

Alternatives Step to repro without using Adaptive Performance:
1- Create a new project
2- Menu Edit > PReferences
3- Alternate between all the preference providers

Actual Result:
Width of the SettingsWindow search field changes

Expected Result:
Width of the Result search field stays the same.

Reproducible in:
2020.2.0a15, 2020.1.0b13, 2020.1.0a11 with Package Version 2.0.0-preview.8.

Note: Adaptive Performance and simulator option is not available in Project settings with Package Version 2.0.0-preview.4.

Environment:
Occurring only on Windows.