Panes are your slides. The pane list in the left sidebar is where you build the sequence, and each pane carries its own grid and a few settings that can override the project defaults.
Each pane has its own grid where blocks snap into place - 3x3 by default, up to 16x16. With a pane selected, the grid selector at the top of the settings sidebar changes its dimensions. A finer grid gives you more layout positions without changing anything about how blocks behave.
You cannot shrink the grid below what the current blocks occupy.
Pane settings include an "Overrides" group with four values that normally inherit from Project Settings: "Autoplay Interval", "Block Radius", "Blocks Gap", and "Blocks Padding". Each shows the inherited value with a lock icon - click the lock to override it for this pane only, click again to return to inheriting.
The layout overrides (radius, gap, padding) animate during navigation. A full-bleed hero pane with zero padding can transition into a bento-style pane with generous gaps and rounded blocks, and PaneFlow animates the layout change itself - the same blocks pull in from the edges, spread apart, and soften their corners.
The "Autoplay Interval" override is practical for autoplaying slideshows where one pane needs more reading time than the rest.