Resize built in (cabinet) oven

[Sydney23]

Hi,

I've added an integrated / built-in oven to a cabinet but the oven is too wide and tall. Once in, I can't then select the oven to resize or get that dialogue in the cabinet/default settings. If I place the oven as free standing, after the warning message about it needing to into a cabinet which I ignore, I can then edit the oven size - but then it won't integrate into a cabinet.

Is there a way of resizing an integrated appliance? In the library somehow?
Yes, I'm a newbie!

many thanks,

Andy