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Use Ctrl key and mouse wheel forward or back to increase and decrease zoom size of window when in transparent mode.
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Readjust the window to the size you need. Minimize it, Alt-Tab it back. Expand it out till it's in fullscreen. then set, it back to it's smaller version. Close it and re-open. You're all set!
2Google wonders why that app isn't more popular, but it looks and feels like it was coded in 1998 – Tyson – 2015-08-04T01:15:07.200
@Tyson I think it's a matter of consistency since Google web UIs tend to be quite crappy. – Franck Dernoncourt – 2015-08-04T01:18:06.607