You can change the vertical space occupied by channels and channel strips in the Mixer; for example, to make channel strips taller when loading inserts or changing EQ settings.
Prerequisite
The Mixer is shown, either in the lower zone or in the Mixer window.
Procedure
In the Mixer, on the line between channel strips and channels, click and drag upwards/downwards.
When the mouse pointer is in the correct position, it appears as a split arrow.