Link the xlim and ylim properties.
Or use or linkaxes()
Here's a demo. It uses tiledlayout instead of subplot but you can easily apply this to subplot as well by replacing "nexttile" with "subplot(___)" and removing "tiledlayout".
x = rand(1,100)-.5 *10;
y = rand(1,100)-.5 * 5;
figure()
tiledlayout(1,2)
h(1) = nexttile;
plot(h(1), x,y,'o')
h(2) = nexttile;
plot(h(2), x,y,'o')
linkprop(h, {'xlim','ylim'})
% OR
% linkaxes(h)
