Ctrl(Cmd on MAC) + Left(Mouse)Click on the panel.
Ctrl(Cmd on MAC) + Shift + Left(Mouse)Click on the panel.
If this operation is successful, it will say so in the info line at the bottom of the SV window.
(Mouse)Right-Click and select the bookmark in the popup list.
Locate the mouse point on the plot to highlight and (Mouse) Right Click to bring up the full menu.
First, make sure that the Fit panel has data and a model selected.
Ctrl(Cmd on MAC) + Shift + Alt + Right(Mouse)Click on the panel.
Then, set up the value in the dialog panel.
If this operation is successful, the new ftol value will be displayed in the info line at the bottom of the SV window.
Note that increasing the ftol value may cause for the fitting to terminate with higher chisqr.