Can I remove the easy-push functionality?

Remove the drawer and place the cash drawer in a way, that you can see the bottom:

Underside of the cash drawer

Remove the three screws as shown here:

Three screws holding easy push spring in place

Now you should be able to see the mechanism in the back of the cash drawer come loose and it can be removed:

Easy Push mechanism

Your cash drawer can now only be opened using the key.
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