In your Heir of the Concord modpack the key to unmap hotkeys in some of the MCM menus is R2, are you setting this in the controlmap file and if so which line in the file has this setting? I am not using a controller and need to unmap a few MCM keybinds, normally unmap is either T or R but this does not work with your controlmap file.
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I found the following in (Deprecated) Controlmap.txt Fixed and Cleaned posts:
// Journal
YButton !0,0x32 back to 0x14
Just for sure I did same think for XButton
XButton !0,0x12 back to 0x2d,0x32
This did the trick for me.