Split View
Split view divides the document pane into 2 or 4 independent regions. Each region is called a pane and has its own page, zoom, view mode and selection.
Split Modes
| Mode | Layout | Panes |
|---|---|---|
| Single (default) | One pane | PrimaryPane |
| Left/Right | Vertical divider | SplitLeftPane + SplitRightPane |
| Top/Bottom | Horizontal divider | SplitTopPane + SplitBottomPane |
| Quad (2×2) | Both dividers | all four split panes |
Activate via View → Split. Click the same option again to collapse back to single.
Why Split?
- Compare two pages — revision against current, site plan against elevation.
- Reference while editing — keep a spec page visible in one pane while marking up another.
- Two views of the same document — each pane can scroll to a different page.
Working Across Panes
- Click inside a pane to make it active. The toolbar and menus target the active pane.
- Each pane has its own thumbnails selection — clicking a thumbnail scrolls the active pane.
- The status bar shows info for the active pane.
- Annotations are per-page, so an edit in one pane is visible in the other pane if that pane is viewing the same page.
Tip — The divider between panes is draggable. Grab it and pull to resize the regions.
Per-Pane State
Each pane independently remembers:
- Current page number.
- Zoom level.
- View mode (Single / Continuous).
- Rotation.
Split view state is not saved to the PDF; it's a session-only layout.
Keyboard Across Panes
Keyboard shortcuts (page up/down, zoom, tool selection) apply to the active pane. Click into another pane to change focus.
Resetting to Single View
View → Single View or press the active split-view button again on the toolbar.
Warning — Collapsing a split view keeps the state of the primary / left / top pane; the other panes' independent zoom and page are discarded.