Shortcut bar

You can display:

Undo, Redo, Brush/Eraser Toggle, Transparent Color, Foreground/Background Color Toggle, Eyedropper Tool, Hand Tool, Save, Copy, Cut, Paste, Select All, Deselect, Invert Selection, Create a Selection from Layer (Brightness), Create a Selection from Layer (Opacity), Transform, Rotate Left, Rotate Right, Flip, Rotate Back, Clear Layer

in the shortcut bar at the bottom of the screen.

Shortcut settings
Fig. Shortcut settings