Hide Other Boxes
HideOtherBoxes is a sandbox setting in Sandboxie Ini available since v0.3 / 5.42. Its runtime fallback is y: entries for processes assigned to a different sandbox are removed from Sandboxie's filtered native process-list results. Entries assigned to the same box, or without a sandbox association, are not removed by this setting. To disable this specific filter:
Setting HideOtherBoxes=n does not guarantee that other-box processes appear through every enumeration method, nor does the setting itself control access to processes by known PID.
In SandMan, the checkbox is Sandbox Options > Advanced Options > Processes > Process Hiding > Don't allow sandboxed processes to see processes running in other boxes. Its direct box-side default is checked; an effective value inherited through configuration may differ from the direct checkbox state.
The value is read on later enumerations, so a configuration reload can affect an already-running process if the NtQuerySystemInformation hook was installed for it. See Hide Non System Processes for the hook and WMI limitations.