If this Makinom you're asking about then change it in: Menu-> Gui Boxed-> General setting->Default Ok/Cancel Buttons-> Ok Setting. Or you can override it if you want to have difference OK size button in: Menu->GUI Boxed->'select your gui box'-> Override default setting-> Ok/Cancel Button.
In both ORK and Makinom, you can find the default settings for the ok/cancel buttons in the menu settings. Each GUI box can override them and use their own ok/cancel button settings :)
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That's due to changing the wrong setting - the Default Choice Header Settings are for header texts above choice buttons, so that's something totally different :)
You need to change the settings in Default Ok/Cancel Button Buttons.
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Menu-> Gui Boxed-> General setting->Default Ok/Cancel Buttons-> Ok Setting.
Or you can override it if you want to have difference OK size button in:
Menu->GUI Boxed->'select your gui box'-> Override default setting-> Ok/Cancel Button.
If you're enjoying my products, updates and support, please consider supporting me on patreon.com!
EDIT: I'm using ORK Framework.
You need to change the settings in Default Ok/Cancel Button Buttons.
If you're enjoying my products, updates and support, please consider supporting me on patreon.com!