The default quality level buttons misaligned when all the target platform support is installed. The "Default Quality" setting button for WebGL moves under "Delete Quality" level button on shrinking inspector window horizontally

1. Open an attached project or create a new project
2. Edit > project settings
3. Player settings > quality settings
4. Shrink inspector window horizontally

Actual Result:
1. Observe that WegGL quality level button moves under delete quality level button
2. It occurs when all the platform supports are installed and listed under quality settings

Expected Result:
1. The button should be anchored under the given platform

Occurring with:
2018.3.0a1, 2018.2.0b5, 2018.1.2f1, 2017.4.4f1, 2017.2.3f1, 2017.1.4f1

Environment:
Windows and Mac