From GeoGebra Manual
The Point Capturing feature is part of the Graphics View and 3D Graphics View Style Bar and offers four different options for points:
- Automatic: turns Point Capturing On when the grid or the coordinate axes are shown, and Off when both are hidden.
- Snap to Grid: when a point is close enough to an intersection of lines of the grid, it will align to it.
- Fixed to Grid: a point can be placed only on the intersections of lines of the grid.
- Off: no capturing is applied to the point.
Note: Snap to Grid and Fixed to Grid options, when selected, remain active even though the grid is hidden.