This is pretty simple, have a heatmap with a lot of genes. I want to hide all rownames except the handful of genes I want to highlight. I have searched on google, on this forum, but could not find a solution.

Anyone have advice?

Code below

pheatmap(MyData,
         cluster_rows = T,cluster_cols = F,
         clustering_distance_rows = 'euclidean',
         clustering_distance_cols = 'euclidean',
         clustering_method = 'ward.D',
         annotation_row = gene_functions,
          fontsize_row = 6,
         fontsize_col = 10,
         cellwidth=10,
         cellheight = 1,
         show_colnames = T, show_rownames=F)

I did find this post that definitely is close to what I want: Add selected row names on pheatmap

I suspect the answer i want is an adjustment of the code in that post, to tell it exactly which rows i want it to exclude or include. Thanks

You have found the answer to your question in the post you link to. Just convert the row.names of the rows you don't want to include to be character(0) and then you won't see them.