Multiselecting: allows you to select different objects and then you can perform actions on all of them.
Grouping: when you have a few objects selected with Multi-select, you can group these objects together.
Duplicating: you can create an identical copy of an object or a group of objects next to, above, or below the selected object or group of objects
Details: open a menu with more object properties on the right part of the screen.
Bottom Left corner:
Delete: you can delete the selected object or group of objects.
Floating transform panel on the selected object or group of objects:
Scale objects by holding down the scale button: move it right to make objects bigger, left to make them smaller.
when tapped (the color of the button is white) - additional scaling options would appear to scale the object in X, Y, Z directions. Only works for a single object.
Rotate around the Y-axis by holding down the rotate button.
when tapped (the color of the button is white) - additional rotating options would appear to rotate the object in X, Y, Z directions. Works for both a single object and a group of objects.
Move objects by holding down the move button.
when tapped (the color of the button is white) - additional moving options would appear to move the object in X, Y, Z directions. Works for both a single object and a group of objects.