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Here is document: https://document.harutheme.com/vidio/.
Video tutorial: https://www.youtube.com/channel/UCnOxXtfrkgq92wgqJCBi55g/videos?view_as=subscriber
In our theme have a notice that Page Options will override Theme Options. You can understand more about it follow this topic: https://harutheme.com/forums/topic/why-theme-options-doesnt-apply-changes/
Hope this helps!