FL Studio channel rack is a widely used feature inside FL Studio, many music producers are not aware that they can zoom in and out of the channel rack inside FL Studio.
This will provide more input patterns inside the channel rack. Now, usually the channel rack is set up with 2 bars which consist of 8 beats.
When anyone opens up FL Studio, this is the default zoom in size of the "channel rack", image shown below:

I am not sure if many people know this, but these 2 bars which are also 8 beats can be changed to 4 bars and 16 beats with a simple click and extrude function of the mouse.
This will provide more input for drum patterns within the FL Studio channel rack.

It's, as simple as that!

As you can see above, the channel rack has been zoomed out to 16 beats, which is 4 bars.
Now this will allow any music producer, or sound designer to input more steps within the "channel rack", I have demonstrated this in the image shown below: