in Sublime Text 3, Build 3143 regarding the adaptive theme: it is cool.
With the registered version of Sublime Text (on macOS) I'm glad to use a feature that enables me to open multiple directory-trees as additional tabs (where the unregistered version only open new windows).
This additional layer of tabs is currently broken in the new adaptive theme.
The "Project"-Tabs are still there, but are floating over the File-Tabs.
Broken adaptive-Theme, with dark color schema: