Isolating and Plotting Individual Cluster

I have the code, which does the Gaussian Mixture Model Clustering on a set of data.

file1='test.csv';

test_data=csvread(file1,1,0);
test_gated= log10(test_data(:,4:5)+200);

X = test_gated(:,1:2);

options = statset('Display','final'); 
gm = fitgmdist(X,4,'CovarianceType','full','Options',options);

idx = cluster(gm,X);
cluster1 = (idx == 1); % |1| for cluster 1 membership
cluster2 = (idx == 2); % |2| for cluster 2 membership
cluster3 = (idx == 3);
cluster4 = (idx == 4);

figure(1)
gscatter(X(:,1),X(:,2),idx)
legend('Cluster 1','Cluster 2','Cluster 3','Cluster 4','Location','best')

This is my output, which gives me 4 clusters.

How would I be able to get any one of the specific clusters, and plot that isolated cluster on a graph? I am stuck and don't know the direction to go towards. Where would I start? Any help will be appreciated. Thank you!