Edit the "Columns gap" Style option in the Share buttons widget below.

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You will be able to see here how the gap between columns change, but you need to save and go to the actual page to see how the space it is not applied while HTML modification is ON.

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This is NOT a problem with minification plugins. This is a CSS problem, a different approach should be used, since HTML modification is necessary for optimization and everybody needs to use it. The word-spacing property cannot be used with minification. It must be replaced with a margin property approach.

You can turn on/off here the minification option to see how it affects the widget

(reload page after changing it)