Go to Preferences > Key Bindings-User
Add the below key value pairs to the existing JSON array (mostly it would be empty previously):
{ "keys": ["ctrl+shift+r"], "command": "reindent"}

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Go to Preferences > Key Bindings-User
Add the below key value pairs to the existing JSON array (mostly it would be empty previously):
{ "keys": ["ctrl+shift+r"], "command": "reindent"}
Learn how to reindent text and create a keybinding for the shortcut.