When selecting multiple items, a floating bar appears underneath. That is the floaty.
From the floaty you can:
Skew comes with a secret menu that grants you full control over spacetime. To find it, simply right click selected layers:
The menu is also available from the floaty, for when your middle finger needs a break
In Skew, the you can pop up the Options sidebar by clicking the Skew icon, at the top left corner of the panel.