Reference > Fathom Menus > Graph Menu > Show/Hide Axis Links

Show/Hide Axis Links

Shows or hides axis link icons. Drop a link on another axis to force them to have the same scale; changing the scale for one axis in a linked set automatically keeps the other axis linked. In the case shown here, the two axes of a single graph have been linked; you can link axes between graphs as well.

The link icons are closed for linked axes.

Disconnect the axes by selecting a closed link and choosing Graph | Unlink [X/Y] Axis.

See also
Dynamically Link Axes to Each Other
Prevent Graph Axes from Automatically Rescaling
Change Axis Scales

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