Settings & keep-time · Keyboard shortcuts
Why doesn't my Storage Studio keyboard shortcut do anything?
Short answer: macOS or another app probably already uses that combination — ⌃Space is often the input-source switch. Pick a different one in Settings → Shortcuts and check the action is switched on.
Usually macOS or another app already uses that combination. ⌃ Space, for example, is macOS's shortcut for switching to the previous input source on many Macs, so it may never reach Storage Studio.
Open Settings → Shortcuts, check the action is switched on, and pick a different combination from its menu. If a Junk Yard shortcut does nothing, also make sure the Junk Yard is enabled in Settings → Junk Yard.