Is there any plug-in or filter that can change or set the width of a glyph in all masters at the same time? I know the transformation filter can do it but only a master at a time, right? Of course you can always type and select each master of the glyphs you want to change the width and do it, but I was just wondering if it could be done without the need to do this. Thank you!
Just the width value? That is a quick script. Put this in the Macro Window, select the glyphs you want expanded, and press Run.
for layer in Font.selectedLayers:
glyph = layer.parent
for glyphLayer in glyph.layers:
layer.width += 50
Change the 50 to whatever you want to expand the widths by.
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Yes! Just the width value! (testing tabular figures widths) I will try that! Thank you so much, Rainer! 
For testing, you could add a Transformation filter in the instances.
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For tab figures, why not try width metrics keys? Like ==500, you can batch-set them in Font view.
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How do I do that?
Excellent idea! Didn’t know much about metric keys! Thank you so much, Rainer!
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