Make your own shortcuts
If Clip Studio Paint doesn’t have a shortcut to a command you can always make one. One frustrating omission from CSP’s list of common commands is an Cmd+F for fill. To create it go to the Shortcut Settings (on a Mac it’s Clip Studio Paint>Shortcut Settings; on a PC it’s File>Shortcut Settings). Select Tools on the Setting Area dropdown, and then locate Fill. Fill is normally mapped to G (which cycles through Gradient and Fill) but we can now add F for Fill.