It is not possible to zoom the window content using cmd + '+' / cmd + '-' like most other apps. It's also not an option in the View menu.
Clicking cmd + '+' / cmd + '-' would zoom window in / out
Sounds reasonable. 馃憤
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@Rokt33r This feature now (0.11.8 at macOS 10.13.6) has a __regression__ with __zoom level display in right bottom corner__
When user hits cmd -/+, the window zooms but the zoom level display is not updated.
This is the UI after hitting cmd + 5 times while it still displays 100%:

@liuderchi Please open a different issue for your issue. I'm closing this issue.
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Sounds reasonable. 馃憤