The description and usage of R-group structures in Marvin can be found in the R-groups and Markush Structures in MarvinSketch paragraph of the Marvin User's Guide.
By default, MarvinSketch displays all the R-group definitions that belong to a scaffold. Sometimes it is very practical to hide the R-group definitions because they take up too much place from the display and we would like to emphasize the scaffold. The result of switching off the R-group definitions can be seen in the picture below.
The code below is taken from
SketchParams.java, where the R-group definitions are hidden using the
setParams method of the
msketchPane. setParams (ParameterConstants.R_GROUPS_VISIBLE+ "=false" );