Changing the background color of the button object to none results in the button displaying with the default background color (#006580). This is a known limitation as of today.
Resolution
Qlik is reviewing QB-29806 for future improvements.
Workaround
To achieve transparency (mimicking none as the background color):
In the button's background option, choose "By Expression"
Fill in the expression as follows:
ARGB(0,0,0,0)
Cause
This feature predates the introduction of transparency in the colorpicker, meaning it was designed to revert to the default color when none is chosen.
Internal Investigation ID(s)
QB-29806
Environment
Qlik Sense Enterprise on Windows August 2023 and higher