In SketchUp, any geometry that’s hidden is still there. You just can’t see or select it. To see the hidden geometry or objects but keep them hidden, choose View > Hidden Geometry or View > Hidden Objects. All hidden entities appear in a ghosted pattern (as shown in the figure), allowing you to select them.
Just show your hidden geometry, select the edges you want to unhide, and choose Edit→Unhide→Selected.
How do you smooth lines in SketchUp?
How to Smooth Unsightly Edges in SketchUp
- Use the Eraser. To smooth edges with the Eraser tool, hold down the Ctrl key (Option on the Mac) while you click or drag over the edges you want to smooth.
- Use the Soften Edges panel.
How do I unhide a group?
Tap in the top right of Facebook, then scroll down to Groups and select your group. Tap More, then select View Group Info. Tap Edit Group Settings. Below Hide Group select Visible or Hidden.