Komatsu D61EXi-24 Operation & Maintenance Manual page 166

TOOLS MENU
The message screen is displayed.
5.
Press "Ok".
6.
Press the item to lock (menu, button, or screen item).
The locked item is indicated in red.
7.
When unlocking an locked item, press that locked item
again.
The unlocked item is not indicated in red any more.
You can unlock all the locked items by selecting "Release all
locks".
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HANDLE CONTROL BOX
AJD02654
AJD02655
AJD02656