\label{ssub:position_scale_section}
\textit{Center} mask button allows for quickly centering a mask on the video track.
-\textit{Normalize} mask button makes it easy to normalize the size of the mask based on the scale of the video.
+\textit{Normalize} mask button makes it easy to normalize the size of the mask based on the scale of the video - about 1/4 the window size in the X and Y
+directions. Normalization makes the mask fit in the space to avoid having
+it wander off of the window, then you can move it around easily before resizing.
The next 3 symbols concern the direction to \textit{drag translate} a mask using the \texttt{Alt+LMB} thus making it easy to preserve the current $X$ or $Y$ value when desirable. For some desktop window managers,
such as \textit{UbuntuStudio 16.4} and \textit{Arch}, the Alt key is already in use by the Operating System
so you will have to use Alt+Ctrl instead.