Create featureplot for certain cluster in UMAP

[WangXYiii0324]

Hi, everyone. When I got the UMAP result of clustering, there are some clusters overlapped with each other. In order to better distinguish them, I would like to create the feature plot only for some certain cluster to show the marker gene expression.
I tried to directly extract the cell barcodes of this cluster and then highlight these cells in the FeaturePlot(), but it seems that it doesn't work. Is there anyone know how to do this?
Thank you!