I don't think players should be able to do this
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But if they could do that then the typo should follow the window and stay included in it like on Excel or Open office board (i.e "DIPLO…" instead of the actual entire "DIPLOMACY" which pass throught the window on the left).
I think the proper way to allow them to temporary mask an entire window and gain visibility without close it should be to implement that button on StarMade windows :
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It would be really really usefull.