NecroButton – An alternative table for raising undead.

I tried to assign a hotkey by entering it in the input field of both the default and custom profiles, but nothing happened except for the letter "F" appearing, which is what I was trying to do. It seems there's nothing more I can do here.

You were on the right track – in the profile folder, in the file input_a2.cfg, there are sections that control windows (WindowScreen); you need to specify the key and command designation in the appropriate section, and then specify the command in the button using GameMessageReactions
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I reviewed both versions countless times, and no matter how hard I try, I really don't understand where this is defined or how it's implemented. If it's possible and someone knows how to implement it, please let me know.

I created a button to exit to InactiveBg.(BackgroundSimpleTexture).xdb and connected an event to it when ESC is pressed.
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Here’s an example of an unfinished battle interface mod –