*Steps to reproduce:*
# Create a new Unity project using the Universal 3D template
# Create a new Material (Assets > Create > Material)
# Select the created Material in the Project Browser window
# Press the burger icon button in the Material Preview section in the Inspector window
# Select "Convert to Floating window" option
# Click the same burger icon button in the Floating Material Preview window
# Observe the Floating Material Preview window

*Actual results:* There are 2 burger icon buttons in the Floating Material Preview window and one of them does nothing when pressed

*Expected results:* Either the burger icon button does not exist like before regression, or the burger icon button opens a dropdown

*Reproducible with versions:* 2023.2.0a19, 6000.0.53f1, 6000.1.11f1, 6000.2.0b9, 6000.3.0a1

*Not reproducible with versions:* 2022.3.64f1, 2023.2.0a18

*Tested on (OS):* macOS Silicon Sequoia 15.5, Ubuntu 24.04