All of the QT GUI widgets and plots have a parameter called GUI Hint. This is used to arrange GUIs in the window, as well as assign them to tabs in a QT GUI Tab Widget.
The format is:
(row, column, row span, column span)
To assign GUIs to certain tabs using the QT GUI Tab Widget, use the format:
Note that tab_id is the ID of your QT GUI Tab Widget
You can combine the row/col and the tab format using a colon, e.g.:
tab_id@1 : 0,0,1,1