Display letters of significance in graph builder when using boxplot and in fit y by x when comparison is performedIdea for this came from How to denote letters to mark significant differences in a boxplot?
These could be displayed (at least) in two platforms Graph Builder and in Fit Y by X when pair comparison is performed.
For Graph Builder these could be found from Box Plot settings on the left and/or from right click under box plot (user might also have to be allowed to choose comparison method).

For fit y by x not sure what would be the easiest place to add these. Maybe button under Means Comparison or into one of the context menus for outline boxes (Connecting Letters Report)
Data Exploration and VisualizationRe: Display letters of significance in graph builder when using boxplot and in fit y by x when comparison is performedHi! Is this feature available? I still don´t know how to add a letter to compare groups in a boxplot.
Re: Display letters of significance in graph builder when using boxplot and in fit y by x when comparison is performed - Status changed to: Acknowledged@jthi - Thank you for your suggestion! We have captured your request and will take it under consideration.
Re: Display letters of significance in graph builder when using boxplot and in fit y by x when comparison is performedthere is no way to do it in the graph or in the left side. The only options are to add the 5 number summary.

Re: Display letters of significance in graph builder when using boxplot and in fit y by x when comparison is performedTo my knowledge this isn't available in Graph Builder and currently you have to either script it or do it interactively. There are few posts in community, one in the opening post and at least one other can be found from here Adding connecting letters ABOVE data points of a line graph