- Edit identical Patterns symmetrically at the same time.
Apply Symmetry Pattern
- Navigate to the 2D toolbar and select the 
Transform Pattern tool or 
Edit Pattern tool.
- Right-click on the Patterns to be linked and select Apply Linked Editing – Symmetry Pattern from the pop-up menu.
- The symmetrized Patterns will be highlighted in light blue.
- The symmetrized Patterns can be edited symmetrically at the same time.
- Navigate to the 2D toolbar and select the Transform pattern tool or Edit Pattern tool.
- Right-click on the Patterns to be unlinked and select Remove Linked Editing from the pop-up menu.
- The symmetrized Patterns will be separated.
- The Patterns can be edited individually.
Comments
Is there an option to relink the patterns after removing symmetry?
To the question from @romainpotier
"Is there an option to relink the patterns after removing symmetry?"
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EDIT:
I found a way better way. You can just select the Symmetrical Pattern and right-click. Then simply select 'Half Symmetric Pattern (With Sewing)' under 'Apply Linked Editing'.
Ignore the text below.
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I found a way to achieve something like what you're asking about. My way:
I put an Internal line inside the shape at the line, where the left and right sides are symmetrical.
Then I made a cut by right clicking on the just created line and selecting 'cut'.
Then I selected both halves of the symmetrical pattern and right-clicked on it and selected 'Symmetric Pattern' (or 'Symmetric Pattern (with sewing)' if you want both halves to be seen).
Hope this works for you or helped somebody else.
Good luck!