The size of the window generated by calling the "uigetfile" function is an operating system preference.
Please try the following workaround-
Call "uigetfile", change the size of the window to the desired size, and then close the window.
Subsequent calls of "uigetfile" will produce a window of the desired size. This window size persists not only after closing and re-opening MATLAB, but also after restarting the computer.
