1) Right click your first "Sandbox Default" and click "Sandbox Settings" as shown in the picture below, click apply.


2) Select the tab "File Migration" and then set the field to the number "6000000", click apply.

Spoiler:

3) Select the tab "Restrictions" and remove the check mark from "Drop rights from Administrators and Power Users groups" as shown below, click apply.


4) Select the tab "Full Access" and then follow the steps in the picture by selecting "Add" then chose your "C:\" (or What ever drive DBO is on) drive, click ok, click apply.


5)Select the tab "Window Access" and then click "Add" then you need to type a "*" click ok, click apply.




Congrats! You are now running a Sandboxed client.