How to set windowstyle modal in APP Designer?

The button named OpenFile ,the callback function is uigetfile.After I click the button,the UIFigure is not in front of my computer screen.In GUIDE,without this problem.

I can't set windowstyle modal in APP Designer.

[VBBV]

Type this in callback function to know the windowatyle mode

 % if true
    % code
 % end
get(0,'DefaultFigureWindowStyle')

If it shows docked then you can set it normal using

 % if true
    % code
 % end
set(0,'DefaultFigureWindowStyle' , 'normal')

Or

 % if true
    % code
  %end
set(gcf, 'WindowStyle','normal');