Because the Selector tool is the most used tool, there is an additional shortcut that lets you switch into the Selector tool to perform a selection or other operation, and quickly switch back to the previous tool. If you are using another tool, you can easily switch to the Selector tool:
Press and release Alt+S to switch to the Selector tool. Press again to return to the previous tool.
Or
Hold down Alt+S to select the Selector tool. Perform the required operation while the keys are held down, then release to return to the previous tool.
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