Operators

Zen Unwrap 

Unwrap by Marked edges and Pack after. Also, you can select edges/faces and do Zen Unwrap. All selected edges/faces will be Marked as Seams and/or Sharp edges and unwrapped after.

Preferences

Auto Mark with Zen Unwrap

Automatically Mark edges by angle for Zen Unwrap.

Selected Only

Separate workflow where only Selected Faces will be Unwrapped and Packed. It includes warnings and Unwrapping options if nothing is selected.

Islands Offset

Offset Islands after Zen Unwrap. (Experimental).

Auto Mark

Automatically Mark edges as Seams and/or Sharp edges.

Mark 

Mark selected edges or face borders as Seams and/or Sharp edges.

Unmark 

Unmark selected edges or face borders as Seams and/or Sharp edges.

Unmark All

Remove all the Seams and/or Sharp edges from the mesh.

Preferences

Mark Seams

Automatically assign Seams.

Mark Sharp Edges

Automatically assign Sharp edges.

Mark Seams by UV Borders

Mark Seams by existing UV Borders.

Mark Seams by Sharp Edges

Mark Seams by existing Sharp edges.

Mark Sharp Edges by Seams

Mark Sharp edges by existing Seams.

Quadrify Islands

Straighten rectangular-shaped UV Islands.

The addon is using the quadrification algorithm by Radivarig.

Preferences

Auto Pin Quadrified

Automatically Pin Islands after Quadrify Islands operation.

Pack After Quadrify

Automatically Pack Islands after Quadrify Islands operation.

Pack Islands

Pack all Islands.

Preferences

Margin

Set space between Islands for Pack Islands operation.

Average Islands Scale

Average Islands scale before Pack Islands operation.

Pack Engine

Select Pack Engine for Pack Islands operation.

The add-on is using the Blender Pack algorithm or UVPackmaster 2 Engine by glukoz.

Select Islands

Select UV Islands.

Select at least one edge/face of the Island(s).

Isolate Islands (Toggle)

Isolate UV Islands (Toggle).

Select at least one edge/face of the Island(s).

Select Overlapped Islands

Select Overlapped Islands.

Works in Blender 2.81 and above.

Select Edge Loop

Select edge loops with Seams respect.

Pin UV Island

Pin UV Island.

Select at least one edge/face of the Island(s).

Unpin UV Island

Unpin UV Island.

Select at least one edge/face of the Island(s).

Show Pinned Islands (Toggle)

Show Pinned Islands (Toggle).

Checker Texture (Toggle)

Add Checker Texture to the mesh (Toggle).

Smooth Mode (Toggle)

Toggle between Auto Smooth 180° (with sharp edges) and regular smooth modes.