There is a bug with the channel mixer in Windows 10.
Lock at the size of the equalizer part and the width of the volume fader.
There is a bug with the channel mixer in Windows 10.
Search the forum, multiple posts around that.
Hold Alt on PC (I think) and a new icon appears in the right area of the window which lets you reset the window settings. Seems to be a feature now with CB10: btw - did you already reset the window settings in your session? no? well, we tend to mess it and you have to find the secret path to remediation!