I have too many channels in the KI gui, how can I reduce them?

When mining a KI1 core, the removal of unused channels will be triggered.

Open the Overview GUI with the top-left button and check if your channels are sufficiently reduced.
If not check the channel with the higest number and clear that channel, eg. by changing the channel of the entities shown in the info section.

Repeat that procedure until your happy with the number of channels.