Formatting numeric values in the uitable is limited -- the only way you will be able to do this will be to convert to a string with the desired format and then display the string -- which means you'll have to convert it back and forth both ways--to a string to display and then back to number to use if changed or read the cell .Data value.
And, if you use a MATLAB table to display then you can't use the .Format property, rules are different for that case...it then will display the data in the same way as the command window does -- so the table column would have to be converted to character strings with the same issues in using it.
Try the below at command line, to illustrate
hUF=uifigure();
V=2E-12;
hUIT=uitable(hUF,'Data',V,'ColumnWidth',{120});
pause(5)
hUIT.Data=compose('%0.12f',V);
hUIT.ColumnWidth={140};
The problem here then will be what if the number next time is 2.3E-12? Then you'll have to have '%0.13f' to display the significant digits and the complications grow...
