When using the 6 Group Spacing Icons you can hold down additional key while executing to invoke different desired actions.
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Ctrl+Click |
Space using Left Most Selection Base |
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Ctrl+Shift+Click |
Space using Right Most Selection Base |
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Ctrl+Alt+Click |
Re-order images based on selection order and space using Left Most Selection Base |
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Ctrl+Alt+Shift+Click |
Re-Order images based on selection order and space using Right Most Selection Base |