Just as a point of clarification there are always at least 2 cross chained combos when you've got more than 1 chainring and a rear cassette.

Big Chainring/Big Rear Cog & Small Chainring/Small Rear Cog are crosschained combinations. Although depending on the chainline of your cranks (&derailleur capacity&chain length&other stuff) those combos can be used with varying levels of success.

Case in point I've got a TA crankset set up as a wide double 50/28. On the big ring there is enough chain and the chainline is close in enough to allow me to use all 5 cogs effectively. The Big/Big combo is still technically cross-chained but its useable.