Option to change the theme is missing in the latest version 
Autor: David T.
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Unless I'm missing something, the option to change your theme was usually under 2 (template). Cant seem to find it.
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It is not there anymore,
you need to select the theme export it then import it in your project you wan't it
Hello,
Library and Template management: What's different in the 2019.1 update:
https://helpcenter.websitex5.com/pt/post/209916
J.P.