Hello, how can I configure different locations for different sandboxes?

Right now, you have to make a manual edit to the configuration file, if you don't want all sandboxes to be located underneath the same drive and "Sandbox" folder.

First, create the sandbox if you haven't already done so:
Sandboxie Control > Sandbox > Create New Sandbox

Then use:
Sandboxie Control > Configure > Edit Configuration
Scroll down to the settings for the sandbox and add a new line that indicates where you want this sandbox to be located.
----
Examples:

"Test2" sandbox with the sandbox located on K: drive, and underneath a "K:\Sandbox" folder:

[Test2]

FileRootPath=K:\Sandbox\%SANDBOX%
Enabled=y
ConfigLevel=7
AutoRecover=y
Template=BlockPorts
Template=LingerPrograms
Template=Firefox_Phishing_DirectAccess
...
...

----
"Test3" sandbox located underneath an "X:\Sandbox" folder:

[Test3]

FileRootPath=X:\Sandbox\%SANDBOX%
Enabled=y
ConfigLevel=7
AutoRecover=y
Template=BlockPorts
Template=LingerPrograms
Template=Firefox_Phishing_DirectAccess
...
...

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You could also use the %USER% variable in the path, if you want to:
FileRootPath=X:\Sandbox\%USER%\%SANDBOX%

Save your work and configure any other Sandbox Settings.