Fix regression in accessibility layout
Fix regression in accessibility layout

Summary:
Fixes a regression (D21716761) in the layout of the accessibility inspector where the layout was accidentally switched from right to bottom.

Also made the region resizable while at it.

Changelog: Fix regression in the layout plugin where accessibility info was rendered in the wrong place

Reviewed By: cekkaewnumchai

Differential Revision: D21903760

fbshipit-source-id: 08623c17428e86ea77d8438e78766a308dbac1e6

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