You can create a flat pattern from a sheet metal model and display the correct flat pattern.
With a single body sheet metal body open, on the Sheet Metal tab, select Create > Create Flat Pattern
.
Select the stationary face from which all flanges are unfolded.
Click OK. The flat pattern is created, and displays.
A Flat Pattern node is created in the Browser.

To return to the folded model, click Finish Flat Pattern
.
In the Browser, click the Activate Flat Pattern radio button.

If a flat pattern is out-of-date with the current sheet metal geometry, it displays as Out-Of-Date
in the Browser.
To update the flat pattern, simply activate it using the Activate Flat Pattern radio button in the Browser. Or, right-click and select Update Flat Pattern
.
To return to the folded model, click Exit Flat in the toolbar.
In the Browser, hover over the flat pattern node, right-click and select Delete.