We don't know what the code is, how you used it, or if it produced any errors. The only thing we know is that you have some code that's supposed to create a figure, but doesn't.
Here's one guess:
% some code that will open a uifigure:
hfig = uifigure();
... or maybe it's more complicated than that. Either we could guess aimlessly as to what the problem is, or you'll have to describe the problem in more concrete terms.
