How to specifically select cluster on Featurescatter on Seurat?
You can use the cells argument to only display the data for a specific subset of cells.  

For example to extract the values for a cluster 2:

# The cluster identity is stored in the meta.data
# In this example there is a clustering column called "RNA_snn_res.0.7" 
# but any metadata column can be used

clust2.cells &lt;- rownames(Seurat.data@meta.data[Seurat.data$RNA_snn_res.0.7 == 2, ])

FeatureScatter(Seurat.data, feature1 = "gene_A", feature2 = "gene_B", cells = clust2.cells)