Where did the Markdown Preview button go in VS Code 1.3.0?

In Visual Studio Code 1.2.0, I was loving the Markdown preview button in the top-right coer of each editor view, which allowed me to quickly create a live preview of my Markdown document (by clicking the Split View button and then the Preview button).

Screenshot of Preview button, highlighted in red:

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Now in 1.3.0, the preview button is no longer there, and the release notes make no mention of its removal. The notes do mention a new Open Preview context menu (listed as a workaround below). I also found an open GitHub issue for this problem with no response (yet).

The only workarounds for Preview on OS X I found were:

• Option 1: Right-click the file in the lefthand list panel, and choose Open Preview.
• Option 2: Press ⌘SHIFTV while on the editor.

But these workarounds are inconvenient for me, and I much prefer the previous workflow. How can I restore the preview button (or equivalent clickable solution)?