Free Trasnform Mode
In Precision Mode, You can rotate your object freely
While placing your object in Precision Mode, you can press and hold the shortcut R to rotate your object freely relative to its selected pivot.
While placing your object in Precision Mode, you can press and hold the shortcut G to scale your object freely relative to its selected pivot.
While placing your object in Precision Mode, you can press and hold the shortcut T to offset your object freely relative to its selected pivot.
Resetting Values
You can reset your free transform values using prefab brush overlay
In your scene view, click the 3 dots button > Overlay Menu
Click to show prefab brush overlay
This overlay with reset options buttons will show for you while you use prefab brush in Precision Mode.
Reset Values After Placing: If true, all your free transforms values will be reset to the original value after you place any prefab