Try this —
Ax = gca;
Ax.YAxis.Exponent = 0;
I checked, and this will work in R2018a according to the R2018a NumericRuler Properties documentation.
Y=[-0.0042 -0.0036];
X=[8 9];
figure
plot(X, Y)
title('Original')
figure
plot(X, Y)
title('Using ‘Exponent’')
Ax = gca;
Ax.YAxis.Exponent = 0;
.
