The “maxHeight” prop should expand the height of the dropdown, which it does. However, it does not expand the height of the background.
If you have a look at the Dash example: Dropdown | Dash for Python Documentation | Plotly you can see that normally “Rome” would not fit on the dropdown. With maxHeight=300
“Rome” now fits in the dropdown, but but the white background height has not been increased (same issue in dark mode).
Minimal example of issue taken from dash dash/documentation
from dash import dcc dcc.Dropdown( [‘New York City’, ‘Montreal’, ‘Paris’, ‘London’, ‘Amsterdam’, ‘Berlin’, ‘Rome’], ‘Paris’, id=‘height-example-dropdown’, maxHeight=300 )