Shortcut keys for Quixel Mixer 2018.1.4 are listed below:

Mixer Shortcuts

• V - Viewport tab
• L - Local library tab
• O - Online library tab
• Space bar - Toggle UI
• Ctrl/Cmd + N - New mix
• Ctrl/Cmd + O - Open mix
• Ctrl/Cmd + S - Save mix
• Ctrl/Cmd + Shift + S - Save mix as
• Ctrl/Cmd + K - Preferences
• Ctrl/Cmd + D - Duplicate layer
• Alt + Click on Layer - Toggle layer clipping
• Ctrl/Cmd + E - Quick Export

Painting Controls

• B - Brush
• E - Eraser
• Middle Mouse Button + S + Drag - Change Brush Size
• Middle Mouse Button + F + Drag - Change Brush Fill
• Middle Mouse Button + O + Drag - Change Brush Opacity
• Shift + Click on ground plane in viewport - Draw lines when painting
• Shift + Click on Eyedropper button - Quick Swatch Eye Dropper
• Z - Paint Displacement Up
• X - Paint Displacement Down
• C - Paint Displacement Flat
• Hold Q - Quick Eye Dropper
• Middle Mouse Button - Match Swatch to Base
• Hold Ctrl/Cmd - Invert displacement direction
• Ctrl/Cmd + Z - Undo paint action
• Ctrl/Cmd + Y - Redo paint action
• Shift + S + Drag - View-Aligned Stroke

Mixer Viewport Controls

• Middle Mouse Button + Drag - Pan scene
• Alt + Left Click + Drag - Rotate scene
• Alt + S + Left Click + Drag - Ortho Rotation Snapping
• Alt + Right Click + Drag up/down - Zoom scene out/in
• Scroll up/down - Zoom scene in/out
• Arrow up/down - Cycle HDRI
• Shift + Right Click + Drag - Rotate Lighting
• Shift + Left Click + Drag - Ground-Aligned Stroke
• 1 - PBR rendering
• 2 - Albedo buffer
• 3 - Metalness/Specular buffer
• 4 - Gloss buffer
• 5 - Roughness buffer
• 6 - Normal buffer
• 7 - Displacement buffer
• 8 - Occlusion buffer
• T - Toggle tiling
• D - Toggle displacement
• P - Toggle Perspective
• F - Focus scene
• Shift + F - Focus and reset angle