Option to change the theme is missing in the latest version 
Автор: 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.
Размещено
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/ru/post/209916
J.P.