You will see a small greyed circle next to the Collection name showing if

it is active (Figure 2.30).

Figure 2.30 - Active Collection

To make a Collection active, you can simply click on their name.

Info: You will also see the active Collection name at the top left corner if

your 3D Viewport.

You can create new Collections using several different options. In the

Outliner Editor, right-click at a space and choose "New" to create a

Collection (Figure 2.31).