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Is there a way to force 16x16 icon size for toolbar icons in GTK3? In GTK2 it was possible by editing ~/.gtkrc-2.0. I just do not know how to do this in GTK3.

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You can try this by creating/modifying ~/.config/gtk-3.0/settings.ini:

gtk-icon-sizes = panel-menu=16,16:panel=16,16:gtk-menu=16,16:gtk-large-toolbar=16,16:gtk-small-toolbar=16,16:gtk-button=16,16

However, your theme may override this in its theme file.

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