/etc/gnuradio/conf.d/gr-wxgui.conf is in gnuradio 3.7.10.1-2+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # This file contains system wide configuration data for GNU Radio.
# You may override any setting on a per-user basis by editing
# ~/.gnuradio/config.conf
[wxgui]
# 'gl', 'nongl', or 'auto'
style = auto
# fftsink and waterfallsink
fft_rate = 15
# scopesink
frame_decim = 1
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