Large Heatmaps default to filling with white (later found this was text) with no documented way to turn off

[markgloverswaybtinternetcom]

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import dearpygui.dearpygui as dpg

dpg.create_context()
dpg.create_viewport()
dpg.setup_dearpygui()

with dpg.window(label="tutorial"):
    dpg.add_button(label="Press me")

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dpg.show_viewport()
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[markgloverswaybtinternetcom]

Documentation does not indicate that an empty value for 'fmt' stops it filling hi resolution heat maps with text.
I found 'format' null in C++ code, stopped it and tried some guesses in Python. I was using the heatmap for spectrograms, so the text was a bit unexpected.