Hover over a channel in the left sidebar.

Click on the ellipsis ().

Click Change color.

Select a color from the grid, use the color picker, or enter a hex code.

Click Confirm to save and apply the color change.

Click outside the box to close the menu.

Click on the gear () icon in the upper right corner of the web or desktop app.

Select Channel settings.

Select a channel.

Select the Personal tab on the right.

Under Personal settings, click on the colored square below Channel color.

Select a color from the grid, use the color picker, or enter a hex code.

Click Choose to save and apply the color change.