Decide your use-case: cold dressing/drizzle (flavor matters) vs cooking/baking (heat stability matters).
If the recipe needs a neutral oil for cooking or baking, choose canola oil or avocado oil as a direct 1:1 swap.
If you want a mild flavor closer to flax’s light nuttiness, choose light olive oil 1:1 and keep flavor-dominant ingredients balanced.
If you’re finishing with a nutty profile, use toasted sesame oil at the reduced ratio; stop short of high heat to avoid bitterness.
For baking emergencies, melt butter first and swap 1:1; check batter thickness and thin with a teaspoon of water or milk if needed.