OK, You are correct about what the button says.
For your future knowledge, for other readers, and for Avast developers (so to change this in the future), I'd like to explain what I meant, and why I wrote the way I wrote it.
In avast 6.x, the same exact tab can be seen by
File System Shields -> EXPERT Settings-> AutoSandbox.
If you pay attention to other shields, you will see the "expert settings" button in the middle of the GUI (Graphic User Interface). Simultaneously, in the upper area of the GUI, you always have the button "settings".
The upper "settings" is the same for all tabs. The "expert settings" is particular for each shield (or for each tab selected on the left side).
To differentiate both buttons, I used the "expert settings" name so to avoid the normal confusion. My intention was for you to click on the lower "settings" button, not the upper (general settings) one.
Since the resulting settings shown by that button are in fact the "expert settings" of the File System Shield, I am used to call the lower settings (particular to the specific shield) the "expert settings", and reserve the "settings" name to the general settings of the program, in the upper area.
To be consistent with the rest of the program, the name of the button should be "expert settings". Using the same name (as it is currently being used, and wrongly IMHO), users would not be sure if they need to use the upper (general) button or the middle/lower one (shield - specific).
This needs to be corrected by Avast Team for the next version.
My apologies for my confusion and not being able to give the simpler (and uniquely identified) path starting from File System Shield. The autosandbox path is not unique (2 "settings" buttons), hence the confusion.