[iCUE v5.4.98 Release Notes]

Well I figured out how to disable the profile switch button.

I made a blank disable key map

Close ICUE completely

went into where the profiles are saved C:\Users\%username%\AppData\Roaming\Corsair\CUE5\profiles

Opened the profiles with notepad++ 

There maybe multiple profiles in this directory. you should select the one that was modified most recently as that should be the one you just added the new keymap to.

Search for name of Key assignment mine was Disable 3

What I highlighted was blank add the value <key>MouseProfileSwitch</key> save it and  reopen ICUE and it should set the key to disabled.

you can verify it on the dashboard

[iCUE v5.4.98 Release Notes]

Still no option to disable profile switch button on the corsair scimitar. Please restore this previous functionality.

[iCUE v5.3.102 Release Notes]

Still no ability to remap the profile switch button on scimitar. This was available in version 4 and below.

[WE'RE LISTENING: iCUE Favorites & Suggestions!]

Rebinding Profile Switch for Corsair Scimitar Pro no Longer works On V5. I have a Corsair Scimitar RGB Elite, and with the latest version of ICUE I can no longer disable to the profile switch button. This worked fine on V4.

[Rebinding Profile Switch for Corsair Scimitar Pro no Longer works On V5]

Agreed, I hope this is looked at very annoying i cant disable or remap the botton