raspberry pi – How do I increase the Debian window header button size?

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I made a DIY DAB radio using a Raspberry Pi 5 and a 7-inch 1024x600px HDMI screen, running Raspberry Pi OS (Debian 12).

The problem is, that the header buttons of each window is too small for operation reliable using the touchscreen.
DAB radio screenshot for illustration

I tried the following

  • gsettings get org.gnome.desktop.interface gtk-theme returns 'PiXnoir'
  • nano /usr/share/themes/PiXnoir/gtk-3.0/gtk.css shows @import url("../../PiXflat/gtk-3.0/gtk-contained.css");
  • therefore I modified nano /usr/share/themes/PiXflat/gtk-3.0/gtk-contained.css
  • I modified the following parameter:

modified codeline

But that did not change the header size at all.

How can I enlarge the header buttons? What did I do wrong?

(If additional system informationa are required, please feel free to ask)

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