Portal offers soundscapes and themes such as Night, Water and Rain.
Pick the one that fits your mood to shape the atmosphere of your session.

When you open the Portal tab, you can select a theme before you start the session.
Each theme changes the overall sound and feel of the session.
Choose the theme that matches what you want right now, for example something calm for night or something more flowing like Water or Rain.

The theme you pick sets the background atmosphere for your session.
This helps you get into the right state without having to search for individual tracks.
You can change the theme each time you use Portal, depending on your mood or time of day.